Vol 4, No 1S (2023)

Conference proceedings

Correlations and age-related changes in central and peripheral hemodynamic parameters

Andreeva I.V., Grigorev A.S.

Abstract

BACKGROUND: One of the current issues of fundamental and clinical medicine is the early diagnosis of pathological changes that may lead to the development of cardiovascular disease.

AIM: The study aimed to investigate age-related changes in the cardiovascular system in healthy individuals by a comprehensive assessment of the correlations between hemodynamic and microcirculatory parameters at different age.

METHODS: The study was conducted on 136 adult volunteers with no clinical or laboratory manifestations of cardiovascular disease. The material was divided into five age groups: adolescence, I and II periods of adulthood, old age, and senile age. Males and females accounted for 50.73% and 49.27%, respectively. Central and peripheral hemodynamic parameters were measured using high-resolution compression oscillometry, ultrasound duplex scanning of aortic arch branches, echocardiography, and reactive hyperemia test on the brachial artery. Microcirculation indices in the skin of the right index finger were studied using a laser Doppler flowmeter before and after the treadmill test. The digital data were processed by the methods of variation statistics using the JASP 0.16.4.0 statistical software package.

RESULTS: An age-related decrease in skin microcirculation indices was observed. A significant statistical dependence of changes in microcirculation indices after physical activity in the groups of old and senile age was found. Left ventricular ejection fraction, cardiac output, cardiac index, stroke volume, and stroke index progressively decreased with increasing age; diastolic blood pressure increased; pliability of the brachial artery vascular wall decreased; total and specific peripheral resistance increased. Blood flow indices in the common carotid arteries (diameter and linear and volumetric blood flow velocity) decreased, whereas resistance index and intima-media thickness increased. Blood flow indices in vertebral arteries (linear and volumetric blood flow velocity) and indices of total blood flow to the brain progressively decreased with age. In addition, the dependence of some indices on gender was revealed.

CONCLUSIONS: With increasing age in healthy people, changes in central and peripheral hemodynamic parameters occur, which do not lead to cardiovascular diseases. Age-related changes in macro- and microcirculation are best detected during functional stress tests and should be considered in clinical practice as a manifestation of the normal aging process.

Digital Diagnostics. 2023;4(1S):9-10
pages 9-10 views

Optimized calculator for a qualitative risk assessment of osteoporotic fractures for the population of Moscow

Artyukova Z.R., Kudryavtsev N.D., Ikryannikov E.O., Titova A.V., Balashov M.K., Petraikin A.V.

Abstract

BACKGROUND: The FRAX tool (a 10-year fracture risk assessment) is recommended to diagnose osteoporosis and optimize the number of patients who need to undergo X-ray densitometry. Due to various circumstances, the integration of a full-fledged FRAX tool into the digital circuits of the Moscow City Health Department is problematic.

AIM: The study aimed to develop a calculator of the 10-year probability of osteoporotic fractures to optimize the routing of patients for examination.

METHODS: An optimized Half-FRAX calculator was created based on the FRAX tool from the University of Sheffield, which was developed using the results of population studies of the Russian Federation. All data used in the original FRAX algorithm, i.e. sex, age, height, weight, and T-criterion (if available) and other important parameters such as a history of fractures, parental hip fractures, smoking, rheumatoid arthritis, secondary osteoporosis, and glucocorticoid and alcohol intake were included in the risk assessment calculator. An algorithm for interaction with the FRAX website was developed and implemented to verify critical levels of patient stratification by multiple consecutive enumerations of different combinations of body mass index (BMI) measurements (0.1 discretization) and age (1-year discretization). Data from clinical guidelines were taken as thresholds.

RESULTS: When implementing the developed algorithm by modeling various combinations of BMI, T-criterion, and risk factors (RF), the absence of RFs and BMI >25 (upper limit of normal) in women was shown to guarantee the exclusion from the “orange zone” where densitometry should be performed. In men, BMI was not a RF. If a RF was present, a patient was recommended to consult a doctor. If no T-criterion was present, but a RF was detected, the patient was indicated for densitometry. Similar results were reported for women with the same indices. In the absence of the RF and with a T-criterion >–2.5, low fracture risk factor was indicated for both men and women.

CONCLUSIONS: An optimized Half-FRAX calculator for the 10-year probability of major osteoporotic fractures was developed, which may optimize the routing of patients for densitometry and reduce the burden on radiology departments in Moscow. This will allow patients to be timely referred to the clinical specialists for consultations. Half-FRAX is integrated into the Osteoporosis Digital Platform (https://telemedai.ru/cifrovaya-platforma-osteoporoz/half-frax).

Digital Diagnostics. 2023;4(1S):11-13
pages 11-13 views

Telemedical follow-up in patients with inflammatory bowel diseases

Akhmedzyanova D.A., Shumskaya Y.F., Mnatsakanyan M.G.

Abstract

Inflammatory bowel diseases (IBDs) represent a group of nosologies including Crohn’s disease and ulcerative colitis. These diseases lead both to the deterioration of the patient’s physical condition and to a pronounced decrease in the quality of life. Currently, healthcare costs of managing patients with IBDs are steadily increasing and are commonly associated with the need for examinations and therapy with expensive drugs and unplanned expenses of healthcare resources for unscheduled consultations, emergency hospitalizations, and surgical interventions. Deterioration of patients’ condition may be associated with self-cancellation of therapy after normalization of the state of health. The use of telemedical technologies (TMTs) is promising for maintaining remission of IBDs, improving adherence to therapy, and reducing the frequency of unscheduled visits to the clinic and the cost of treating IBD complications (including surgery). The efficiency and benefits of TMTs in patients with IBDs were assessed in comparison with standard face-to-face follow-up. A literature search relevant to the review was conducted in the PubMed database. Papers were selected that assessed the efficiency of telemedical interventions among patients with IBDs as compared to the standard face-to-face follow-up group. The evaluation criteria included the degree of the disease activity, risks of IBD recurrence, quality of life of patients, adherence to therapy, healthcare costs, and frequency of visits to healthcare facilities. Telemedical interventions were conducted using the Internet, mobile applications, various telemedical platforms, SMS messages, and phone calls. The telemedical follow-up groups received access to educational materials and online consultations with a specialist upon request and completed questionnaires to assess disease activity, adherence to therapy, and quality of life. The degree of IBD activity and risk of recurrence and the level of adherence to therapy did not differ significantly between the telemedical intervention and standard face-to-face follow-up groups. The study by L. Pang et al. showed that the patients’ quality of life in the group of telemedical intervention was significantly higher (p=0.03) [8]. Another advantage of using TMTs is the provision of access to educational materials about IBDs and the possibility of remote contact with the treating physician. The patient’s ability to obtain necessary information reduces the need for unplanned visits to medical facilities and the cost of organizing medical care for patients with IBDs. The use of TMTs allows to monitor IBD activity as effectively as face-to-face follow-up, improve the patients’ quality of life with IBDs, and reduce costs for organizing care for patients with these diseases by decreasing the frequency of unscheduled visits to the doctor and conducting unnecessary additional examinations.

Digital Diagnostics. 2023;4(1S):14-16
pages 14-16 views

Automated algorithm for diagnosing gastrointestinal bleeding

Budykina A.V.

Abstract

BACKGROUND: Gastrointestinal bleeding (GIB) is a complication of many diseases of the gastrointestinal tract (GIT), including erosive and ulcerative lesions, vascular malformations, diverticula, and tumors. In developed countries, the GIB mortality rate ranges from 5% to 15%, reaching 30%–40% in the group of patients with severe recurrent bleeding.

AIM: The study aimed to develop an automated diagnostic algorithm for patients with GIB.

METHODS: Knowledge engineering is used to extract terms and their relationships from the scientific literature related to the GIT. After agreement with the experts, information on the diagnosis and treatment of patients with GIB was arranged using a MS Excel spreadsheet editor. For building GIB localization rules, the study included data from histories of 280 patients aged 20–94 years (61 [44; 74]); of these, 47.5% were women, while all others were men. The patients were diagnosed and treated at the Municipal Clinical Hospital No. 31 between 2008 and 2021. For testing the algorithm, data from histories of 514 patients aged 20–96 years (62 [46; 74]) were used; of these, 57% were men, while the rest were women. The patients under study were diagnosed and treated at the Municipal Clinical Hospital No. 17 and the Municipal Clinical Hospital No. 31 between 2008 and 2022. For each study subject, data were available on 37 signs, including 19 clinical, 3 laboratory, and 15 endoscopic signs. Statistical data analysis was performed using the Statistica 13 software package, R Project programming language, and GraphPad online calculator. The software implementation of the algorithm was performed using the JavaScript programming language.

RESULTS: Using polynomial logistic regression, an algorithm for differential diagnosis of GIB according to the preliminary localization of the bleeding source was developed. Having the data from 8 clinical and laboratory parameters with probability, a preliminary localization of the bleeding source may be determined. Thus, the probability of bleeding localization in the upper, middle, and lower GIT accounts for 84% (95% CI [78%; 89%]), 84% (95% CI [74%; 91%]), and 75% (95% CI [69%; 80%]), respectively. A final algorithm to support clinical decision-making in the management of patients with GIB (sergisa.smrtp.ru/medical/edit.html) was developed and implemented as a web-service, working with 92.2% efficiency.

The sequence of operations of the algorithm for diagnosing GIB is as follows:

  1. Obtaining clinical and laboratory signs of a patient with suspected GIB.
  2. Determining the nature of bleeding (overt/occult) using literature data, assessing the severity of bleeding (mild/medium/severe) based on Gorbashko classification, and detecting the preliminary localization of bleeding (upper/middle/lower GIT) by regression equation.
  3. Providing recommendations for selecting a research method based on production rules and expert opinions.
  4. Obtaining endoscopic signs.
  5. Determining the localization and source of bleeding using the production rules.
  6. Providing recommendations for stopping/preventing GIB based on literature and expert opinions.

CONCLUSIONS: An algorithm to support clinical decision-making for the management of patients with GIB, considering the nature of clinical manifestations and the severity and the cause of bleeding based on expert opinions, production rules, and polynomial logistic regression, which allows to assume a preliminary localization of the source of bleeding, was developed for the first time in the Russian Federation. The developed algorithm is implemented as a web-service and may be integrated into the medical information system at the automated workstation of a surgeon, an endoscopist, and a gastroenterologist to support clinical decision-making in the management of patients with GIB.

Digital Diagnostics. 2023;4(1S):17-19
pages 17-19 views

Therapeutic learning as an organizational technology of tomorrow

Vorobeva A.V., Yakushin M.A.

Abstract

BACKGROUND: According to the World Health Organization, global population aging is the main trend in the development of the society on the planet. Russia ranks 116th worldwide in terms of life expectancy. The development and implementation of measures aimed at preserving the able-bodied population of the country and slowing down the current trend of aging of the population with a focus on increasing life expectancy is manifested in national projects such as Health and Demography. Health-saving technologies for prolonging effective professional longevity of medical workers of older age groups will preserve a labor resource of the country and exclude economic losses of the state.

AIM: The study aimed to determine the significance of individual risk factors affecting the professional effective longevity of physicians and form a set of measures to prolong the professional competence of physicians of older age groups.

METHODS: In this study, the unit of observation is a physician providing medical care in the outpatient segment of Moscow and the Moscow region. The total number of subjects was 378. Sociological, analytical, and statistical methods and the method of organizational modeling were used. The main method was a face-to-face survey that included questionnaire data, questions on training, seniority, category, workload, and information assurance, and two blocks of questions to assess professional competencies and cognitive functions.

RESULTS:

  1. An age-related decrease in the level of the physician’s professional competence.
  2. An age-related decrease in the effectiveness of the prescribed treatment.
  3. A tendency toward an age-related increase in the proportion of cognitive disorders among physicians.
  4. Data analysis showing the need to implement a set of measures aimed at supporting the professional effective longevity of physicians of older age groups.

CONCLUSIONS: The organizational technology represented by a complex of measures providing prolongation of professional effective longevity of physicians of older age groups was proposed. Essentially, the organizational technology is the prevention of chronic non-infectious diseases in conjunction with measures to optimize work activities and stimulate the professional competence of the physician. Therapeutic Learning Technology is a parallel annual dispensary examination of physicians of older age groups followed by a therapeutic and rehabilitation course based on the morbidity profile and combined with a cycle of continuing medical education. The therapeutic and rehabilitative course should include older physicians undergoing cognitive training and hemodynamic stabilization. Information support (a block of federally approved training materials, i.e. normative legal acts regulating medical activity, clinical guidelines, video manuals on schools for different categories of patients, and other materials) is placed at the geriatric contact center, providing each physician from the target group with prompt access both for the period of treatment and rehabilitation course and the entire period of the physician’s medical activity.

Digital Diagnostics. 2023;4(1S):20-21
pages 20-21 views

Evaluation of the effectiveness of telemedical technologies in patients with digestive diseases

Gazizova Y.A., Bakirkhanov D.S., Nefedova T.S., Kostikova N.V., Akhmedzyanova D.A., Tashchyan O.V., Shumskaya Y.F., Mnatsakanyan M.G.

Abstract

BACKGROUND: The use of telemedical technologies (TMT) is widespread in providing care to patients of various profiles. However, TMTs are hardly ever used in gastroenterology, despite the extensive digitalization of healthcare. Potential sites for the use of TMTs among gastroenterological patients were assessed.

AIM: The study aimed to assess the effectiveness and benefits of TMTs in patients with digestive diseases.

  1. Patients with colorectal cancer (CRC): Screening and postoperative management. The TMT intervention increased the number of patients screened for CRC compared to standard face-to-face counseling. In addition, the quality of preparation for colonoscopy was higher in patients who interacted with the physician via TMTs compared to the control group. Most studies reported positive effects of TMTs on quality of life and physical activity in patients with CRC. However, the study by K. Beaver et al. showed that the incidence of CRC recurrence did not differ in the TMT and face-to-face groups.
  2. Patients with nonalcoholic fatty liver disease (NAFLD): Correction of lifestyle. When assessing the use of TMTs among NAFLD patients, a significant decrease in alanine aminotransferase and aspartate aminotransferase activity was found compared to that in face-to-face management. The results of the body mass index reduction are contradictory. The most pronounced tendency towards weight loss was observed with the telemedical follow-up of patients over a 6-month period.
  3. Patients with irritable bowel syndrome (IBS): Treatment and monitoring of symptoms. Two directions are distinguished in the treatment of IBS by ТМТs. The first is cognitive behavioral therapy (CBT). H. Everitt et al. showed clinically significant improvement in 72.8% of cases after 12 months of web-based CBT. The advantages of using telemedicine in the delivery of CBT include the geographical independence of the physician and the patient, personalization of treatment, and the possibility of ongoing support for the patient and his or her family. The second direction is the use of special diets, such as low-fermentable nutrient diets (FODMAP). Patients following the FODMAP diet supervised by the mobile app reduced symptom severity (odds ratio 55; 95% confidence interval 11–98, p=0.01). Special mobile apps (IBS Constant Care) were used to monitor the condition of patients with IBS, which analyze input data and assess severity, providing information to both the patient and the physician.
  4. Patients with inflammatory bowel disease (IBD): Patient training and telemonitoring. The study by L. Pang et al. proved that the patients’ quality of life in the telemedicine intervention group was significantly higher (p=0.03). Another advantage of using TMTs is the provision of access to educational materials about IBD and the possibility of remote contact with the treating physician. The patient’s ability to obtain necessary information reduces the need for unplanned visits to medical facilities, thus reducing the cost of organizing medical care for patients with IBD. The degree of IBD activity and risk of recurrence and adherence to therapy did not differ significantly between the telemedicine intervention group and the standard face-to-face follow-up group.

METHODS: A literature search relevant to the review was conducted in the PubMed database. The studies taken for assessment were those on the use of TMTs among patients with IBD, IBS, NAFLD, and CRC. TMTs were used to access educational information and dietary recommendations, provide information on lifestyle adjustments and physical activity, remind patients to take medicines, consult with physicians, and assess disease activity by completing online questionnaires. The various studies used text messaging, e-mail, mobile apps, websites, and videoconferencing apps as a means of communication.

RESULTS: The use of telemedicine in the management of patients with digestive diseases showed high efficiency. TMTs contribute to:

  • Improved quality of life in patients with digestive diseases.
  • Increasing physical activity of patients with CRC and NAFLD.
  • Improved quality of CRC screening.
  • Maintaining remission of IBD and CRC as effectively as face-to-face monitoring.

Moreover, the use of TMTs allows personalized treatment, ensures the ongoing support of the patient and his or her family by the medical staff, and provides patients with access to quality educational materials about the disease.

CONCLUSIONS: Thus, the use of TMTs is promising in the treatment of digestive diseases and requires wider introduction into practice.

Digital Diagnostics. 2023;4(1S):22-26
pages 22-26 views

The concept of responsible artificial intelligence as the future of artificial intelligence in medicine

Germanov N.S.

Abstract

Active deployment of artificial intelligence (AI) systems in medicine creates many challenges. Recently, the concept of responsible artificial intelligence (RAI) was widely discussed, which is aimed at solving the inevitable ethical, legal, and social problems. The scientific literature was analyzed and the possibility of applying the RAI concept to overcome the existing AI problems in medicine was considered. Studies of possible AI applications in medicine showed that current algorithms are unable to meet the basic enduring needs of society, particularly, fairness, transparency, and reliability. The RAI concept based on three principles — accountability for AI activities and responsibility and transparency of findings (ART) — was proposed to address ethical issues. Further evolution, without the development and application of the ART concept, turns dangerous and impossible the use of AI in such areas as medicine and public administration. The requirements for accountability and transparency of conclusions are based on the identified epistemological (erroneous, non-transparent, and incomplete conclusions) and regulatory (data confidentiality and discrimination of certain groups) problems of using AI in digital medicine [2]. Epistemological errors committed by AI are not limited to omissions related to the volume and representativeness of the original databases analyzed. In addition, these include the well-known “black box” problem, i.e. the inability to “look” into the process of forming AI outputs when processing input data. Along with epistemological errors, normative problems inevitably arise, including patient confidentiality and discrimination of some social groups due to the refusal of some patients to provide medical data for training algorithms and as part of the analyzed databases, which will lead to inaccurate AI conclusions in cases of certain gender, race, and age. Importantly, the methodology of the AI data analysis depends on the program code set by the programmer, whose epistemological and logical errors are projected onto the AI. Hence the problem of determining responsibility in the case of erroneous conclusions, i.e. its distribution between the program itself, the developer, and the executor. Numerous professional associations design ethical standards for developers and a statutory framework to regulate responsibility between the links described. However, the state must play the greatest role in the development and approval of such legislation. The use of AI in medicine, despite its advantages, is accompanied by many ethical, legal, and social challenges. The development of RAI has the potential both to solve these challenges and to further the active and secure deployment of AI systems in digital medicine and healthcare.

Digital Diagnostics. 2023;4(1S):27-29
pages 27-29 views

Diagnosis and treatment of the giant malignant peripheral nerve sheath tumor in the anterior mediastinum: A case report

Gofman A.A., Vasiliev Y.A., Esakov Y.S., Tukvadze Z.G., Panina O.Y.

Abstract

INTRODUCTION: Malignant peripheral nerve sheath tumor (MPNST) occurs in young and middle-aged people, more frequently in those with the genetic disease known as neurofibromatosis type 1 (NF1). Approximately, 50% of people with MPNST have NF1 and 13% of people with NF1 will get MPNST during their lifetime.

CASE REPORT: A 30-year-old patient after surgery for MPNST of the right hip in 2013 was observed. In 2017, a relapse was detected, and combined treatment was performed, including surgical excision of the relapse and postoperative distance radiotherapy with a total focal dose of 66 Gy. In 2018, MPNST of the left femoral nerve was diagnosed, and the tumor was excised. In 2020, a chest X-ray diagnosed a single focus of localized opacity in the anterior mediastinum, adjacent to the right lung. Computed tomography (CT) was performed to further verify the neoplasm, which revealed a single hypodense focus in the anterior mediastinum, adjacent to the right lung. According to histological examination of a tumor biopsy obtained by transthoracic ultrasound-guided biopsy, MPNST was verified. Magnetic resonance imaging (MRI) with intravenous contrast enhancement, including real-time MRI, was performed to assess the invasion of the mass into soft tissues and vessels and to plan surgical treatment. The following surgeries were done: right thoracotomy, removal of a neoplasm of the anterior mediastinum with resection of the upper lobe of the right lung, and marginal resections of the lower lobe of the right lung. This case demonstrates a rare localization and non-standard instrumental diagnosis of mediastinal MPNST. Apart from CT scanning, the patient underwent MRI of the thoracic organs. MRI allows assessing the invasion of the neoplasm into the surrounding tissues. This cannot always be achieved by CT scans, including those with contrast enhancement. Invasion is an important component in the planning of further surgical treatment tactics.

CONCLUSIONS: MPNST is a tumor with an aggressive course and a poor prognosis due to resistance to therapy. This clinical case demonstrates a rare localized MPNST with a recurrent course and metastases to the lungs. The current radiological methods, such as CT and MRI, may be used effectively both for diagnosing MPNST and determining the appropriate surgical access to the lesion and the extent of surgery.

Digital Diagnostics. 2023;4(1S):30-32
pages 30-32 views

Ethical issues associated with the use of virtual reality in medicine

Grebnyakova D.A., Shilkina Y.I.

Abstract

Due to improvements in the medical techniques used, virtual reality technologies are increasingly used to treat various diseases. Simultaneously, various ethical issues emerged. Knowing exactly what problems the treating physician and the patient may be facing is important to increase the effectiveness of therapy. This will help minimize or at least prevent negative consequences. A qualitative secondary study was conducted on the ethical issues arising from the application of virtual reality technologies in treatment. Papers suitable for analysis were searched using the keywords “virtual reality”, “ethical issues”, and “medicine”. The works of the last 10 years were selected, most of the sources being at most 5 years old. After analyzing papers and studies which describe the experience of applying virtual reality technologies in medicine, the range of ethical problems that are currently relevant was determined most accurately. Firstly, the vulnerability of patients is evident, which arises from the realism of the avatars and the deep immersion in the virtual world. Without the physician’s supervision, the patient may experience a high degree of psychological pressure, which has a negative effect. Secondly, strong emotional involvement is possible, which may develop attachment to the artificial intelligence and cause derealization, depersonalization, and other mental disorders. Thirdly, active interaction with the virtual world may be accompanied by long-lasting effects, such as gaming disorder. Finally, patients may have difficulties in distinguishing between reality and simulation, which affects autonomous choice and compromises informed consent. Virtual reality technologies may potentially change the lives of trauma patients and improve their quality of life. However, these changes are accompanied by ethical issues that must be addressed with respect to the vulnerability and nature of trauma.

Digital Diagnostics. 2023;4(1S):33-34
pages 33-34 views

Hydraulic circuit for pulse flow simulation in the tissue-mimicking aortic phantom

Kodenko M.R., Guseva A.V.

Abstract

BACKGROUND: Computed tomographic angiography (CTA) is the “gold standard” in the diagnosis of most vascular pathologies. The optimal method to improve this technique is the use of anthropomorphic tissue-mimicking phantoms, since CTA is accompanied by radiation exposure and the risk of allergic reactions when using contrast agents. In addition to compliance with the X-ray properties of the vessel, the pulsations occurring in the aorta in vivo must be simulated. A review of existing solutions demonstrates a small number of national developments in this area at a relatively high cost of foreign analogues. Moreover, the lack of reproducible methodology for creating pulse flow simulation devices using available and inexpensive materials is worth noting.

AIM: To develop a hydraulic circuit to simulate pulse blood flow in a tissue-mimicking aortic phantom.

METHODS: A literature analysis of existing pulse flow simulation devices and tissue-mimicking phantoms of the abdominal aorta was conducted. The medical and technical requirements for the designed device were formulated. The control circuit was developed, the circuit element base was determined, and the hydraulic circuit prototype was assembled. Based on a literature review, a material suitable for reproducing the biomechanical characteristics of arterial tissue was selected. A simplified phantom of the abdominal aortic segment was made. The device model included a simplified abdominal aortic phantom, a control system, a pump, a pressure sensor, a flow meter, and a flow regulator. Initial testing of the developed circuit in the basic signal mode and in the real flow profile simulation mode was performed. The basic signals were periodic rectangular signals reproduced at different frequencies, simulating normal, rapid, and slow heart rate. Using pulse-width modulation, a profile of the pressure pulse wave was obtained.

RESULTS: The developed hydraulic circuit allowed successful reproduction of pressure and flow velocity profiles in a tissue-mimicking aortic phantom. Further development of the project will involve fabrication and validation of the circuit (using anthropomorphic versions of the phantom) and simulation of the angiographic study.

CONCLUSIONS: The results may be useful for the improvement of CTA techniques and the development of angiosurgical training stands.

Digital Diagnostics. 2023;4(1S):35-36
pages 35-36 views

Automated assessment of facial nerve dysfunction

Dembovskiy M.V., Boiko A.A.

Abstract

BACKGROUND: Facial neuropathy at the peripheral level (unilateral muscular weakness of the entire half of the face) is a common neurological disorder. Assessment of the facial nerve dysfunction grade is necessary to track the dynamics of treatment and monitor the effectiveness of rehabilitation. For this purpose, worldwide clinical practice uses grading systems, the most popular of which are the House-Brackmann, Yanagihara, and Nottingham scales. Such methods are non-universal and based on visual diagnosis, which relies solely on the subjective experience of the physician. Consequently, objective measurements and automation are needed to track the dynamics of recovery. With the use of image processing and computer vision techniques, this task became feasible.

AIM: To develop a method of automated assessment of the facial nerve dysfunction grade by biometric facial analysis to monitor the patient’s recovery dynamics.

METHODS: As part of the collaboration with the Herzen Moscow Research Institute of Oncology, a database of target group patients with grades IV (4 people), V (4 people), and VI (11 people) of facial nerve disfunction according to the Haus-Brackmann scale was compiled. A control group consisted of 20 students from the Bauman Moscow State Technical University. During registration, subjects were asked to perform a series of following mimic tests: raising the eyebrows, closing the eyes, smiling, smiling with effort, inflating the cheeks, pouting the lips, and articulating with effort. Control points of the eyebrow, eye, and mouth areas were used to assess the degree of facial asymmetry. The two-dimensional MultiPIE model, implemented in the dlib library and containing 68 control points, was used as a facial model. A program code in Python was written, which calculates asymmetry coefficients based on changes in the coordinates of control points when the patient performs mimic tests.

RESULTS: A study was conducted to determine statistically significant differences between asymmetry coefficients in the control group and patients. Based on the Mann-Whitney criterion, asymmetry parameters during some mimic tests showed statistically significant differences (p <0.05). Thus, asymmetries in the forehead when raising the eyebrows (0.00 < 0.05), in the mouth when smiling (0.026 < 0.05), in the mouth when smiling with effort (0.00 < 0.05), in the mouth when pouting the lips (0.039 < 0.05), and in the mouth when articulating with effort (0.004 < 0.05) were revealed.

CONCLUSIONS: The results prove the performance of the proposed method and show the need for additional research, particularly the search for differences between groups of patients with different severity and the development of a classification model for machine learning.

Digital Diagnostics. 2023;4(1S):37-39
pages 37-39 views

Effect of extrapleural silicone filling on lung function in patients with bilateral destructive tuberculosis

Donchenko D.V., Chushkin M.I., Krasnikova E.V., Bagirov M.A.

Abstract

BACKGROUND: Despite the success of the fight against tuberculosis, the proportion of patients with multidrug- and extensively drug-resistant pathogens continues to grow. According to the World Health Organization, the effectiveness of treating patients with multidrug- and extensively drug-resistant mycobacterium tuberculosis (MBT) worldwide is 48% and 34%, respectively. The lack of efficiency of chemotherapy in this category of patients leads to complex surgical treatment of tuberculosis.

AIM: To investigate the effect of surgery on respiratory function of staged surgical treatment with extrapleural silicone filling (ESF) in patients with bilateral destructive pulmonary tuberculosis.

METHODS: From 2012 to 2022, extrapleural pneumolysis with silicone implant filling in combination with lung resection on the opposite side was performed in 14 patients with extensive bilateral destructive tuberculosis. The control group included 29 patients who underwent lung resection on both sides. The groups were comparable in terms of sex, age, form of the underlying disease, and spectrum of MBT drug sensitivity. External respiratory function was studied by forced spirometry on Master Screen Pneumon devices by Viasys Healthcare with determination of forced volume vital capacity (FVVC) and forced expiratory volume per 1 s (FEF1).

RESULTS: The dynamics of spirometric parameters after surgical treatment were as follows: FVVC was –1.05±0.47 and –1.74±0.76 liters (p <0.05), and SPH1 was –0.95±0.6 and –1.33±0.5 liters (p <0.05) in the ESF group and in the resection group, respectively. In the main group 10 (70%) patients showed diverse changes of the ventilatory function. Thus, 5/14 (35%) patients had worsening, whereas 5/14 (35%) patients had increased functional indices. In the main group, the decrease in respiratory indices was significantly lower compared with the control group, indicating the effectiveness of the proposed technique. Staged surgical treatment with both bilateral consecutive resections and the use of ESF in combination with resection on the opposite side was accompanied by a decrease in pulmonary ventilatory function. In the group of ESF patients, a moderate decrease in the indices was observed.

CONCLUSIONS: When choosing surgical treatment using extrapleural pneumolysis with silicone implant filling, ESF should be performed at the first stage to preserve the maximum ventilatory function of the lungs. The use of ESF in staged surgical treatment of patients with extensive destructive tuberculosis allows expanding the functional operability of patients with limited respiratory reserves.

Digital Diagnostics. 2023;4(1S):40-42
pages 40-42 views

Role of telemedical technologies at all stages of treatment of nephrological patients

Dorofeeva E.G.

Abstract

BACKGROUND: Patients who, due to great distance or for other reasons, are unable to visit the medical center, must be provided with high quality and accessible medical care. Quality assurance and improvement of two-way communication between the patient and the medical staff must be ensured. The work is conducted at https://nefrocentr.ru.

AIM: The study aims at improving the efficiency and quality of medical care for patients of nephrological profile, i.e. patients with chronic kidney disease (CKD) of grade IIIb–V (pre-dialysis stages), patients undergoing renal replacement therapy (hemodialysis and peritoneal dialysis), and renal transplant recipients to reduce emergency hospitalizations and mortality and improve overall survival, as well as developing and implementing telerehabilitation and improving quality of life.

METHODS: The Telenephrocenter platform was created with the support of the Moscow Health Department, the Moscow Center for Innovative Technologies, and the Moscow Social Development Complex (Grant project No. 25-12-1/22 for the creation of a digital ecosystem for the Moscow Nephrology Cluster to promote alternative models of home nephrology care for patients with grades IIIb-IV-V CKD and kidney donor recipients).

  • Application and improvement of existing online platforms for remote monitoring: video consultations, use of questionnaires and health assessment scales, therapy correction, dialysis program, and group telerehabilitation.
  • Creation of educational video tutorials for patients to improve literacy with the further formation of a library of knowledge to teach the rules of life, nutrition, self-control, physical activity, hygiene, therapy, and peritoneal dialysis procedures.
  • Telepatronage and follow-up of patients on peritoneal dialysis.

RESULTS: The system is a multidimensional information base that allows collecting data on the patient’s health status outside of the medical facility. Over 150 patients after autologous kidney transplantation, 80 patients on peritoneal dialysis, 25 patients on hemodialysis, and 23 patients on pre-dialysis CKD stages are under remote monitoring. The system enables the doctor to adjust the prescription of drugs, provide an urgent response to patients’ problems, and select the correct algorithm for behavior in a critical situation. Monitoring is based on questionnaires to which the patient answers according to a schedule set by the doctor. The questionnaire contains a set of symptoms that the patient chooses based on the intensity of the color. The aggregate of the responses forms a “heat map” of health status, which, when viewed remotely, allows the doctor to determine whether the patient has a problem and what kind of problem he or she has. Thus, the doctor makes informed decisions about further treatment. The resource allows patients to review a wide range of information material. Online consultations for patients, i.e. tele-educational activities for groups of nephrological patients depending on the type of pathology with the development of video tutorials from doctors on major problems and side-effects, are conducted. The effectiveness of the ongoing therapy (drug therapy and renal replacement therapy) is assessed remotely to adjust, cancel, and select the drug therapy. Weekly classes on physical rehabilitation and dietary support and nutrition are offered in an online format.

CONCLUSIONS: The creation of the digital ecosystem of the Moscow nephrology cluster to provide telesupport to all nephrology patients plays an important role in everyday life. The ability to get quality timely care allows for quality control of patients. Questionnaires, including assessment of the psychological state of patients, provide early detection of complications after correction of immunosuppressive therapy and increase patients’ adherence to therapy. Conducting online patient schools on dietary and physical activity modification helps to reduce anxiety and improve mood, increase physical activity, form good eating habits, and adjust dietary intake. These conclusions are based on weekly monitoring of patient diaries.

Digital Diagnostics. 2023;4(1S):43-45
pages 43-45 views

Ultrasound as the main method for diagnosing peripheral nerve injuries in mine blast trauma

Dubrovskikh S.N., Tatarina A.V., Gumerova E.A., Koryagina A.D.

Abstract

BACKGROUND: The amount of published data related to peripheral nerve blast injuries is limited.

AIM: The study was aimed at determining the accuracy and sensitivity and assessing the specificity of ultrasound in the diagnosis of peripheral nerve injuries in mine blast trauma.

METHODS: A total of 159 patients (274 peripheral nerves) were examined. Ultrasound was performed according to the standard technique using a HI VISION Avius HITACHI scanner with an EUP-L74M linear transducer (a frequency range of 5–13 MHz) and a preset musculoskeletal system ultrasound program. The duration of nerve injuries ranged from 2 to 273 days. All patients were men aged 20 to 48 years. Peripheral nerves were damaged as a result of mine blast trauma. Statistical analysis was used to assess sensitivity, specificity, and diagnostic accuracy. These characteristics were calculated according to the qualitative assessment of surgical intervention, the results of conservative treatment, and the method under study (ultrasound).

RESULTS: A total of 274 damaged peripheral nerves were examined. The Group 1 included 93 (34%) nerves that required surgical intervention. In Group 2, consisting of 181 (66%) nerves, conservative treatment was used. Most of the nerves (47 [51%]) in Group 1 were damaged due to the compression effects of scarring in the surrounding tissues. Seventeen (18%) partial violations of the anatomical integrity of nerves with the formation of intramural and marginal neuromas were detected. Multiple and single nerve injuries were observed in 95 (59.7%) and 64 people (40.3%), respectively. Peripheral nerves of the upper extremities were damaged more frequently (185 [67.5%]), whereas nerves of the lower extremities were damaged in 89 (32.5%) cases. Ultrasound showed an increase in the cross-sectional area of nerves, blurred contours, decreased echogenicity, and changes in the bundle structure up to the complete absence of differentiation of individual fascioculi. The formation of neuromas was observed in complete and partial nerve ruptures. All 93 nerves in Group 1 underwent surgical intervention, particularly, external neurolysis (32 [34%]), internal neurolysis (15 [16%]), nerve suture (15 [16%]), excision of neuroma followed by microsurgical epineural suture (18 [19%]), and autoneural plasty (11 [12%]). In 2 (3%) cases, a decision was made to abstain from plasty and perform a tendon transposition due to a pronounced diastasis. All patients of Group 2 were shown to have a wait-and-see approach, and conservative therapy was prescribed. In 179 (99%) cases, complete recovery of sensory and motor activity was observed within 21 days. In 2 (1%) patients, a repeated ultrasound was performed due to no effect of treatment. Compression by scar tissues was revealed, and surgical intervention was made.

CONCLUSIONS: In mine-explosive impact, ultrasound is the leading method for diagnosing peripheral nerve injuries. Ultrasound with sensitivity of 97.8% and specificity of 98.8% reveals lesions for which surgical treatment is indicated. The diagnostic accuracy is 98.5%.

Digital Diagnostics. 2023;4(1S):46-49
pages 46-49 views

Magnetic resonance imaging of the temporomandibular joint: An integrative approach

Dushkova D.V., Vasilev Y.A., Lezhnev D.A.

Abstract

BACKGROUND: According to various data, orofacial diseases occur in the population in 20%–85% of cases. The most common cause of maxillofacial pain unrelated to the dental system is temporomandibular joint (TMJ) dysfunction, which is defined as a disruption of the anatomical relationship during natural movements. Magnetic resonance imaging (MRI) is the method of choice for diagnosing joint pathology.

AIM: MRI with static, pseudodynamic, and dynamic protocols were optimized for targeted diagnosis of TMJ dysfunction.

METHODS: Classical examination of the TMJ is performed in a closed and open mouth position. However, the images obtained do not reflect the location of the intra-articular disc at all stages of mandibular motion.

RESULTS: After a static examination in two oral positions, pseudodynamic sagittal T1 weighted imaging (WI) scans were obtained. The patient was asked to divide the movements from full closure to full mouth opening into five steps. The examination was conducted with the MRI operator and the patient acting together. The scans assessed the position and shape of the meniscus at five stages of mandibular movements. The performed program is leading in the assessment of the disc shape changes at each stage of the mouth opening. Wide coverage of the studied area allows to visualize both articular relations of internal structures and surrounding soft tissues, including contraction of the lateral wing muscle and superficial and deep parts of the masseter muscle. The final stage was a dynamic T2 WI scan performed by the patient individually. The obtained series of images represents sequential movements of the condyle, maximally approximating the natural mouth opening. The pulse sequence helps to assess the amplitude of motion of the mandibular condyle and hypermobility, which can be difficult when performing static images with standard mouth expanders.

CONCLUSIONS: An optimized dynamic and pseudodynamic TMJ study protocol is an essential part of the precise diagnosis of TMJ dysfunction and allows for differential diagnosis between muscle spasm and intra-articular disc adhesion and reliable visualization of intra-articular relationships during mouth opening.

Digital Diagnostics. 2023;4(1S):50-52
pages 50-52 views

Quality of life and adherence to therapy in patients with chronic heart failure who were remotely monitored by chatbot compared to the standard follow-up group for 3 months

Emelianov A.V., Zheleznykh E.A., Kozhevnikova M.V., Ageev A.A., Zektser V.Y., Belenkov Y.N.

Abstract

BACKGROUND: Chronic heart failure (CHF) is one of the leading causes of death. Telemedicine and remote monitoring (RM) are a way to increase life expectancy and quality of life in patients with CHF. Methods based on messengers familiar to patients promote adherence and do not require additional training.

AIM: To compare quality of life and adherence to therapy in patients with CHF who were on RM using a chatbot compared to the standard follow-up (SFU) group for 3 months.

METHODS: Patients with CHF on optimal drug therapy discharged from the hospital were included in the study. Comparison groups were formed according to the method of observation, particularly, RM and SFU. A chatbot was set up for patients in the RM group. Monitoring was done using a seven-question survey sent daily. The signs of decompensation (red flags [RF]) were increased edema, dyspnea, body weight ≥2 kg per week, and changes in individual parameters of heart rate and blood pressure. If a RF was detected, telephone contact was made, and the therapy was corrected if necessary. Quality of life was assessed according to the Minnesota Quality of Life Questionnaire for patients with CHF (highest, 0 points; lowest, 105 points), and adherence was assessed using the Adherence Scale of the National Society for Evidence-based Pharmacotherapy.

RESULTS: A total of 60 patients were included in the study; 37 patients completed a 3-month follow-up. The RM group (n=17, 13 men, 76.5%; median age 61 [51; 62]) and comparison group (n=20, 14 men, 70%; mean age 64.9±8.9) were comparable according to the functional class (New York Heart Association), but differed in ejection fraction (42.8±13% versus 53.2±10.4% [p <0.05]). Adherence to the chat-bot was 67.2%. Adherence to therapy was not significantly different between the RM and SFU groups accounting for (17 [100%]) and (18 [90%], respectively, (p=0.62). In the RM group, RF was detected in 7 (41%) patients. Only one patient required correction of therapy. Patients in the RM group required no referral to a medical facility, whereas 2 patients in the SFU group required medical care. Quality of life was statistically significantly higher in the RM group, reaching 28.7±13.9 points compared to 37.7±17.9 points in the SFU group (p=0.04).

CONCLUSIONS: After 3 months, patients in the RM group were committed to the chatbot, with adherence to therapy comparable to the SFU group. Quality of life was statistically significantly higher in the RM group. Patients in the RM group did not go to medical facilities, in contrast to the SFU group. The limitations of the study were the small sample size and short follow-up period. The results require further research to obtain additional data.

Digital Diagnostics. 2023;4(1S):53-56
pages 53-56 views

Magnetic resonance imaging for non-invasive diagnosis of various forms of endometriosis in women with infertility

Efimova A.A., Sergienya O.V., Maschenko I.A., Zazerskaya I.E.

Abstract

BACKGROUND: Endometriosis is one of the most common causes of infertility, affecting approximately 6%–10% of women of reproductive age. For many decades, laparoscopic surgery has been considered the “gold standard” for diagnosing various forms of endometriosis. However, diagnostic laparoscopy, despite its widespread use, is an invasive and expensive procedure with certain risks. Current scientific literature increasingly shows that the methods of radiological diagnosis (ultrasound and magnetic resonance imaging [MRI]) are the main and most promising for verification of endometriosis. The advantages of MRI over ultrasound are multiplanar images, high tissue contrast, and smaller size of detectable heterotopias.

AIM: To assessing the sensitivity and specificity of MRI for diagnosing different forms of endometriosis.

METHODS: A retrospective analysis of the medical histories and instrumental studies of 129 women of reproductive age (mean age of the participants was 30.5±4.6 years) with a clinical diagnosis of infertility and suspected genital endometriosis was conducted. At the first stage of the study, the patients underwent a comprehensive MRI with one-stage magnetic resonance hysterosalpingography to assess the pelvis and tubal patency. Further, laparoscopic surgery (LS) was performed to confirm/refute the diagnosis of genital endometriosis, provide surgical treatment, or further search for possible causes of infertility. The results obtained with MRI and LS were compared, and the sensitivity and specificity of MRI for diagnosing external and internal genital endometriosis were assessed.

RESULTS: According to the data obtained, the specificity of MRI for diagnosing peritoneal endometriosis was 74% (95% confidence interval [CI], 57%–85%), and the sensitivity was 94% (95% CI, 87%–99%). Diagnostic accuracy of the technique was 86% (95% CI, 79%–91%). The most frequent localization of endometrioid heterotopias was retrocervical (41%). The specificity of this technique for diagnosing endometrioid ovarian cysts was 92% (95% CI, 82%–97%), and the sensitivity amounted for 98% (95% CI, 90%–100%). Diagnostic accuracy of the technique was 94% (95% CI, 88%–96%). The specificity and sensitivity of MRI for the diagnosis of adenomyosis were 96% (95% CI, 92%–99%) and 99% (95% CI, 87%–100%), respectively. Diagnostic accuracy of the technique was 97% (95% CI, 93%–99%). Our results were consistent with the literature data on the accuracy of MRI for diagnosing endometriosis.

CONCLUSIONS: Based on the results, MRI is a promising non-invasive method for diagnosing various forms of endometriosis. The performance of a comprehensive MRI allows obtaining sufficiently accurate information about the condition of the pelvic organs, detecting the manifestations of genital endometriosis, and reducing the time for examining women with infertility.

Digital Diagnostics. 2023;4(1S):57-59
pages 57-59 views

Three-dimensional reconstruction of the pelvic bones on MRI scans

Ikryannikov E.O.

Abstract

BACKGROUND: Pelvimetry is an important part of the obstetric examination for predicting a mismatch between the size of the fetus and the mother’s pelvis, which leads to difficulty or impossibility of vaginal delivery. Contracted pelvis is one of the main causes of maternal birth trauma and perinatal morbidity and mortality.

AIM: To create a computer vision model for automatic segmentation and three-dimensional (3D) reconstruction of the pelvic bones.

METHODS: A 3D U-Net-based neural network was used and trained on T2 weighted images in frontal projection (repetition time, 7500; echo time, 130; slice thickness, 4mm; field-of-view, 40×39; matrix, 256×256). The sample size covered 49 patients. The training and test samples included 42 and 7 examinations, respectively. The segmentation of areas of interest was done manually and verified by a specialist. The sample size was justified by achieving representativeness of the data for obtaining a qualitative model (according to the Sorensen–Dice coefficient).

RESULTS: 3D reconstructions of the pelvic bones were obtained. The average Sorensen-Dice coefficient on the accuracy of pelvic bone segmentation in the test sample was 0.86. The result justified the use of a 3D U-Net-based neural network as a tool capable of perceiving a 3D structure of images and conducting qualitative segmentation. The results allow further work on automating the determination of key points at reconstructions.

CONCLUSIONS: A computer vision model for automatic segmentation of the pelvic bones to obtain 3D reconstruction of images was created. This enabled the next stage of the study, i.e. the development of a model for determining the key points in the images and the distances between the points.

Digital Diagnostics. 2023;4(1S):60-61
pages 60-61 views

Comparison of awareness and attitudes toward artificial intelligence among Russian- and English-speaking students at Orenburg State Medical University

Kalinina M.L., Svitachev A.P., Biswas D., Vishnu P.

Abstract

BACKGROUND: Artificial Intelligence (AI) is actively implemented in medicine. Since medical students are future physicians, an assessment of their awareness and attitudes toward AI is important.

AIM: To compare the degree of awareness and attitudes toward AI among Russian-speaking students of the Orenburg State Medical University (OrSMU) from the Russian Federation and English-speaking students from the Republic of India.

METHODS: From March 12 to 25, 2023, a voluntary anonymous survey (28 questions) was offered to OrSMU students using the Google Forms platform. An English-language version was prepared for foreign students. All responses were analyzed statistically (calculation of mean values using Likert scale, Student’s t-test, and Pearson’s chi-square test).

RESULTS: A total of 331 students participated in the survey, including 214 Russian-speaking and 117 English-speaking participants (127 males, 202 females, and two did not indicate gender). All participants were divided into 2 subgroups: junior (1–3 years, 200 participants) and senior year (4–6 years, 131 participants) students. The vast majority of respondents (92.3%) knew what AI is, with a higher percentage (p<0.001) among Russian-speaking students (95.8%) versus English-speaking students (84.6%). Only 34.1% of Russian-speaking and 46.2% of English-speaking students (p=0.032) were aware of the possibility of using AI in medicine. A total of 28.5% and 23.4% of Russian-speaking and 44.4% and 38.5% of English-speaking respondents, respectively, were aware of the use of AI in diagnostic radiology and pathological anatomy (p=0.004). Students expressed the greatest agreement with the statement that AI will play a significant role in the development and support of medicine in the future (mean Likert scale value of 4.23). Students were the least likely to agree with the statement that AI’s diagnostic abilities are superior to the human physician’s clinical experience (mean of 2.84). In the case of a disagreement between the AI and the physician, 76.7% of respondents would trust the latter to make the final decision. Most respondents considered diagnostic radiology, electrocardiogram analysis, and pathological anatomy to be promising areas for the use of AI (91.3%, 71.3%, and 70.4%, respectively). For the rest of the statements about attitudes toward AI, the average values ranged from 3.63 to 4.33. Among the disadvantages of using AI, the threat of data leakage was reported. The advantages were quick data analysis and assistance in diagnosis.

CONCLUSIONS: English-speaking students were more aware of the use of AI in medicine, whereas students from Russia showed a more positive attitude toward AI. However, in the case of a disagreement between the physician and the AI, both groups of respondents would trust the physician to make the decision.

Digital Diagnostics. 2023;4(1S):62-65
pages 62-65 views

Analysis of retinoblastoma-associated genes using bioinformatic methods

Klimov K.Y.

Abstract

BACKGROUND: Retinoblastoma is a common neoplasia that affects the visual organ in young children. The mortality rate is approximately 15%. In 91% of cases, surgery with enucleation is required, which significantly reduces the patient’s quality of life. Early diagnosis of the disease may help to correct approaches to treatment of retinoblastoma, significantly increasing the chances of preserving vision. This is important since approximately 95% of retinoblastoma cases are diagnosed before the age of 5. Using bioinformatic methods, a comprehensive analysis of the patterns and connections between the retinoblastoma-associated genes was conducted, which may further form the basis of molecular genetic testing for diagnosing this oncology.

AIM: The study aimed to comprehensively analyze the genes and their products associated with retinoblastoma to reveal patterns of oncologic development.

METHODS:

  1. Obtaining and sorting the list of genes using the OMIM and COSMIC databases (https://omim.org/; https://cancer.sanger.ac.uk/cosmic).
  2. Calculating gene ontology categories using DAVID and PANTHER services (https://david.ncifcrf.gov/; http://pantherdb.org/).
  3. Reconstructing the gene network using the GeneMANIA service (https://genemania.org/).
  4. Analyzing the three-dimensional (3D) structure of proteins using the PDB (RCSB) database (https://www.rcsb.org/).

RESULTS: After sorting retinoblastoma-associated genes, the OMIM.org database generated a list of 139 elements. After sorting and comparison with the results of a similar query in the COSMIC database, RB1, KRAS, SYK, MYCN, and BCOR retinoblastoma-associated key genes were identified. The resulting list was analyzed for gene ontology categories using DAVID and PATHER services. The most significant categories for retinoblastoma genes were cell cycle regulators, in particular regulators of the transition from G to S phase and regulators of transcription from the RNA polymerase II promoter. Gene network structure analysis for retinoblastoma genes using the GeneMANIA service showed the existence of dense and linked gene clusters with cell cycle and transcriptional regulator genes at the center. Using the PDB database, 3D structures of key gene expression products were obtained.

CONCLUSIONS: The development of molecular genetic testing of retinoblastoma for the activity of expression of associated genes and their products in the prenatal and/or postnatal period is required to improve the retinoblastoma monitoring system. The results of the study may serve as input data for this testing.

Digital Diagnostics. 2023;4(1S):66-69
pages 66-69 views

Ethical issues of implementing artificial intelligence in medicine

Konkov M.I.

Abstract

Artificial intelligence (AI) systems are highly efficient. However, their implementation in medical practice is accompanied by a range of ethical issues. The “black box” problem is basic to the AI philosophy, although having its own specificity in relation to medicine. A selection of relevant papers for the last three years by citations and their analysis through PubMed and Google Scholar search engines was conducted to study the problems of the AI implementation in medicine. One of the central problems is that the algorithms to justify decisions are still unclear to doctors and patients. The lack of clear and reasonable principles of AI operation is called the “black box” problem. How can doctors rely on AI findings without enough data to explain a particular decision? Who will be responsible for the final decision in case of an adverse outcome (death or serious injury)? In routine practice, medical decisions are based on an integrative approach (understanding of pathophysiology and biochemistry and interpretation of past findings), clinical trials and cohort studies. AI may be used to build a plan for disease diagnosis and treatment, while not providing a convincing justification for specific decisions. This creates a “black box”, since the information that the AI considers important for making a conclusion is not always clear, nor is it clear how or why the AI reaches that conclusion. Thus, Juan M. Durán writes, “Even if we claim to understand the principles underlying AI annotation and training, it is still difficult and often even impossible to understand the inner workings of such systems. The doctor can interpret or verify the results of these algorithms, but cannot explain how the algorithm arrived at its recommendations or diagnosis”. Currently, AI models are trained to recognize microscopic adenomas and polyps in the colon. However, doctors still have insufficient understanding of how AI differentiates between different types of polyps despite the high accuracy, and the signs that are key to making an AI diagnosis remain unclear to experienced endoscopists. Another example is the biomarkers of colorectal cancer recognized by AI. The doctor does not know how algorithms determine the quantitative and qualitative criteria of detectable biomarkers to formulate a final diagnosis in each individual case, i.e., a “black box” of process pathology emerges. For the trust of doctors and patients to be earned, the processes underlying the work of AI must be deciphered and explained, describing how it is done sequentially, step by step, and a specific result is to be formulated. Although the “black box” algorithms cannot be called transparent, the possibility of applying these technologies in practical medicine is worth considering. Despite the above problems, the accuracy and efficiency of solutions does not allow to neglect the use of AI. On the contrary, this use is necessary. Emerging problems should serve as a basis for training and educating doctors to work with AI, expanding the scope of application and developing new diagnostic techniques.

Digital Diagnostics. 2023;4(1S):70-72
pages 70-72 views

Preoperative computed tomography in the planning of median resternotomy in children

Korochkina E.S., Khasanova K.A., Abramyan M.A., Bedin A.V.

Abstract

The capabilities of computed tomography (CT) in the diagnosis of mediastinal adhesions and measuring the density of adhesions when planning midline resternotomy in children were assessed, and the effect of preoperative CT on the incidence of surgical complications was studied. According to several authors, the frequency of resternotomies in cardiac surgery is up to 20% of the total number of surgeries per year and is accompanied by significant difficulties in the isolation of the heart and vessels. In pediatric cardiac surgery, complex congenital heart disease (CHD) mostly requires a staged approach. The staging of complex CHD correction and the need for repeated surgeries in most cardiac defects make the problem of safe repeated surgical access urgent. Postoperative adhesions are one of the most acute problems in modern cardiac surgery. The formation of adhesions is an inevitable reaction of the body after primary cardiac surgery. Massive adhesions that develop after surgery most commonly lead to adhesion of the heart and major great vessels to the posterior surface of the sternum. These changes are especially pronounced in children due to the high reactivity of the body and the lack of technical possibility and expediency of pericardial suturing after surgery. Rough adhesions during resternotomy complicate the cardiac surgeon’s task and increase the risk of complications. The main dangers are damage to various structures in the thorax such as the right and left heart, aorta, coronary arteries, pulmonary artery, and brachiocephalic vein. The diagnosis of postoperative adhesions in the mediastinum before resternotomy is difficult. CT has the widest diagnostic capabilities for assessing mediastinal adhesions. When performing CT as a part of preoperative resternotomy planning, it is important to examine the mediastinal topography, assess the degree of adjacency of the pericardium and mediastinal structures, determine the presence and density of adhesions, and assess patency and diameter of great vessels to select cannulas and cannulation methods necessary for emergency start of cardiopulmonary bypass (CPB) in cardiac trauma. These criteria are important when planning midline resternotomy to reduce the risks of traumatization of cardiac structures and great vessels and allow correction of surgical tactics and timely preventive surgical measures. Depending on the density, extent, and localization of adhesions, the cardiolysis technique and cannulation of great vessels required for initiation of emergency CPB may be changed. The use of preoperative CT when planning midline resternotomy in children allows to predict the risks of damage of cardiac structures and great vessels and visualize adhesive bands and measure their density, which helps the surgeon to adjust surgical tactics regarding the method and volume of cardiolysis and assess patency and diameter of great arteries and veins, thus determining the cannulation method and cannula diameter in advance if urgent CPB is needed. Therefore, standardization of CT description protocols for midline resternotomy planning with assessment of key criteria is an urgent task and requires further development.

Digital Diagnostics. 2023;4(1S):73-75
pages 73-75 views

Comparison of the duration of generating radiological protocols with keyboard and voice input

Kudryavtsev N.D., Sharova D.E., Vladzymyrskyy A. .

Abstract

BACKGROUND: Speech recognition is becoming increasingly common in the national healthcare system. One of the first specialties to implement this technology on a large scale was radiology. However, the efficiency of voice input and its effect on the length of time required to complete medical records remain unresolved.

AIM: To assess the efficiency of speech recognition in generating radiological protocols of different modalities and types.

METHODS: The retrospective study was conducted at the Moscow Reference Center of the Research and Practical Clinical Center for Diagnostics and Telemedicine Technologies of the Moscow Department of Health. A total of 12,912 radiological reports on fluorography, mammography, chest computed tomography (CT), contrast-enhanced magnetic resonance imaging (MRI) of the brain, and contrast-enhanced CT of the abdomen and pelvis were included in the study by simple random sampling. The size of all samples exceeded 766 reports, calculated with regard to the size of the general population of over 100,000 reports. The Voice2Med software was used to fill in the radiological protocols. Intergroup comparison was performed using the Mann–Whitney U-test with a statistical significance level of 0.05.

RESULTS: The average duration of generating fluorographic protocols in the keyboard and voice input groups was 189.9 s (0:03:09) and 236.2 s (0:03:56), respectively (p <0.0001). For mammographic reports, the duration was 387.1 s (0:06:27) and 444.8 s (0:07:24), respectively (p <0.0001). For radiographic reports, it amounted to 247.8 s (0:04:07) and 189.0 s (0: 03:09), respectively (p <0.0001), and for chest CT, it was 379.7 s (0:06:19) and 382.7 s (0:06:22), respectively (p=0.12). For MRI of the brain, the protocols were generated for 709.9 s (0:11:49) and 559.9 s (0: 09:19), respectively (p <0.0001), and for contrast-enhanced chest, abdominal, and pelvic CT scans, it took 2714.6 s (0:45:15) and 1778.4 s (0:29:38), respectively. Voice input slowed down the preparation time of mammographic and fluorographic protocols. This is due to the use of a structured electronic medical document in medical facilities to describe the results of the examinations. Speech recognition showed the greatest efficiency in generating MRI and CT protocols. Such reports contain a large number of pathological changes, both target and incidental findings, which requires a detailed description by the radiologist in the examination protocol.

CONCLUSIONS: Speech recognition in generating radiological protocols showed different efficiency depending on the modality and type of the radiological protocol filled in using the voice input system. This approach is optimal for describing CT and MRI scans.

Digital Diagnostics. 2023;4(1S):76-78
pages 76-78 views

Digital diagnostics: A computer application for lymph node metastases in cervical cancer

Kuznetsov A.I.

Abstract

BACKGROUND: Since 2020, staging accuracy improvements in cervical cancer (CC) revealed that major errors occur due to missed metastases to regional lymph nodes. The presence or absence of metastases seriously affects the staging of cancer and, consequently, its treatment methods, since metastases make cancer inoperable.

AIM: To develop an application to help the doctor in predicting metastases to regional lymph nodes in CC, with the ability of installing on any personal computer regardless of the operating system (Windows, Linux, or Mac OS) and saving data about the patients.

METHODS: The development was performed on the .NET platform (framework v4.7.2), by means of C# language, based on a proprietary prognostic model using seven blood parameters such as erythrocyte sedimentation rate, erythrocytes, hemoglobin, fibrinogen, D-dimer, and platelet aggregation with adenosine diphosphate and soluble fibrin monomer complexes.

RESULTS: A window application was developed that automatically calculates the probability of metastases to regional lymph nodes in СС and provides the ability to save the data from the input form and the predicted value into TXT and/or CSV files. TXT and CSV formats are supported in various operating systems. The .txt file allows each individual patient’s prognosis results to be saved in a separate file for easy printing and attachment to the patient’s electronic or paper medical record. The CSV file format enables the aggregation of data of all patients by adding line-by-line data from the input form to the end of the file.

CONCLUSIONS: The developed application facilitates the process of using the patented formula to diagnose metastases to regional lymph nodes in СС at the early stages of examination, which allows choosing the optimal tactics and, consequently, improving the prognosis of the disease.

Digital Diagnostics. 2023;4(1S):79-80
pages 79-80 views

Assessment of chewing efficiency with artificial intelligence

Levashov N.E., Gus’kov A.V., Oleynikov A.A., Domashkevich N.S.

Abstract

BACKGROUND: Artificial intelligence (AI) is a system based on machine learning of neural networks. AI structure resembles nerve tissue, having the so called “neurons”, i.e. mathematical codes. A neural network has three levels, including the input layer (information enters the system), the hidden layer (multidimensional data is analyzed), and the output layer (the system generates conclusions). Current neural networks use a “perceptron”, i.e. a neuron consisting of a large number of interconnected input and hidden layers, which makes the system capable of self-learning and analysis of non-linear data and generalization and processing of incomplete information, including the method of projection onto latent structures.

AIM: To develope a program based on multivariate data analysis to determine the chewing efficiency at the stages of prosthetics.

METHODS: In 2016, the Department of Orthopedic Dentistry and Orthodontics developed and tested a program for determining chewing efficiency based on the analysis of digital occlusiograms obtained by scanning dental prints on a wax plate. The results were processed by mathematical methods of multivariate data analysis using the projection on latent structures (the partial least-squares [PLS-2] model), which allowed assessing the relationship between the value of chewing efficiency and the area and brightness characteristics of the areas corresponding to occlusal contacts. The program compared the measurement results with the reference occlusiograms in the database and gave a conclusion. The experiments yielded statistically significant results for the efficiency of the program compared to traditional chewing tests. Due to the relevance of implementing AI in orthopedic treatment, the decision was made to improve the training methods of the program to update the existing array of reference data. Starting in 2019, 24 occlusiograms were added to the previously received data with dental defects from 9 to 12 teeth. Using an expanded database, the program, when analyzing the occlusiogram of a new patient, allowed to consider changes in chewing efficiency obtained earlier with the Trezubov chewing test for various defects of the dentition and compare the reference and minimally achievable values of chewing efficiency. The program algorithm was verified by the researchers using the classical Trezubov chewing test. Chewing efficiency was measured as a percentage.

RESULTS: The obtained combinations of the digital algorithm parameters for assessing chewing efficiency resulted in increased accuracy in the range of 4%–6% compared to the traditional Rubinov and Ryakhovsky chewing tests.

CONCLUSIONS: A digital algorithm for assessing chewing efficiency allows for quick and accurate assessment without the use of time-consuming analog tests.

Digital Diagnostics. 2023;4(1S):81-83
pages 81-83 views

Use of surgical templates in the daily practice of the oral surgeon

Logunkova V.G., Mezhlumyan A.A.

Abstract

BACKGROUND: Three-dimensional (3D) technology allows for the creation of individual surgical templates. This is a special construction, providing precise placement of dental implants in the jaw tissue. Templates are divided by the type of fixation into bone pins and screws and dental and gingival pins. The surgical template is made by 3D printing from a special resin. The technology allows the computer modeling to be transferred precisely to the patient’s jaw. The optimal angle for implant insertion and free overlapping of the template, which has holes for positioning and cooling the mucosa, is important to consider. The goals of template making are the correct positioning of the implant and the accuracy of placement, which affects the success of further prosthetics. The template is the link between surgery and prosthetics. Proper positioning of the implants increases the accuracy of the orthopedic prosthesis.

AIM: The study was aimed to compare the standard implantation protocol and implant placement using a 3D-printed surgical template.

METHODS: Comparative assessment of two groups of patients was conducted. Group 1 was implanted using a surgical template, whereas Group 2 was implanted according to the standard technique, without a template. In total, 35 patients with partial adentia and 10 patients with complete adentia were examined. The effectiveness of surgical templates during the placement of dental implants and the risks of complications were assessed.

RESULTS: In Group 1, where surgical templates were used, a 40% decrease in the duration of surgery, a 90% reduction in the gingival incision area, and accurate positioning of the construct were observed. Postoperative complications such as pain, swelling, bleeding, and numbness developed less frequently by 70%. Group 2 was implanted according to the standard technique; however, the implant deviation from the planned position was observed in 35% of patients. The effectiveness of surgical templates lies in the accuracy of implant positioning and denture fabrication and reduction of complications.

CONCLUSIONS: The use of surgical templates is indicated in complicated clinical cases, critical bone atrophy, and for avoiding damage to anatomically important areas. The planning of the surgical template is simultaneous with the placement of the implant and with consideration of the subsequent prosthetic construction, since the accuracy of positioning affects the accuracy of the prosthetic construction. The use of advanced technologies increases the effectiveness of dental implantation.

Digital Diagnostics. 2023;4(1S):84-86
pages 84-86 views

Multidisciplinary approach to postmortem diagnostics

Lozina M.V., Shiripenko I.A., Sidorova O.A., Soldatova A.A., Tarasova P.A., Kuznetsov V.A., Malygin B.V.

Abstract

BACKGROUND: The technique that allows detecting various pathologies and clearly identifying the cause of death and other associated diseases without disturbing the integrity of the skin refers to postmortem radiological diagnostics and is called “virtopsy”. The number of autopsies decreases worldwide, which creates the need to use alternative non-invasive methods, including virtopsy. The main method of postmortem radiology is multislice computed tomography (CT), with its advantages including high sensitivity to bone pathology. Postmortem radiological diagnostics allow supplementing the classical autopsy. This multidisciplinary approach helps visualize a wide variety of pathologies and assist the pathologist in the diagnostic search.

AIM: To assess the possibility of applying radiological diagnostic methods in the pathological anatomical practice and features of non-invasive autopsy (virtopsy) and its differences from the classical autopsy.

METHODS: The archival material including macro preparations of two lower limbs with tumor-like masses of unclear genesis (the upper third of the femur and the calcaneal tuber) was used. The biomaterial was previously encased in a specially treated gelatin medium, which ensured its preservation and left parts of the CT scanner intact. Multislice CT was used for radiological assessment of the preparations. From the primary CT sequences obtained, scans with the best visualization in the bone and soft tissue windows were selected, and three-dimensional (3D) reconstruction was applied. Scans and 3D reconstructions of images of tumor-like masses of the heel and thigh bones were obtained. Interpretation of the borders of the mass, characteristics of morphology and possible source of growth of the neoplasm allowed assuming a malignant nature of the tumor, suggesting its bone origin. Further histologic examination in both cases confirmed the neoplasm (osteogenic sarcoma).

RESULTS: CT scans and 3D reconstructions of images of tumour-like masses in the heel and femur were obtained. The interpretation of the boundaries of the mass, the morphological characteristics and the possible source of growth of the neoplasm suggested a malignant nature of the tumour, suggesting a bony origin. Further histological evaluation in both cases confirmed the nature of the neoplasm (osteogenic sarcoma).

CONCLUSIONS: The use of postmortem radiological diagnostic elements provides a sufficiently accurate verification of the nature of some pathologies. However, the absence of tissue damage and disturbances of intact topographic characteristics play not the least role in the postmortem diagnosis. In contrast to autopsy, this technique allows to return to the original appearance of the structures examined and, if necessary, start the diagnostic search anew. Moreover, specialists from other regions can be remotely involved by sending the data of CT scanning.

Digital Diagnostics. 2023;4(1S):87-89
pages 87-89 views

Preparation of abdominal computed tomography data set for patients with abdominal aortic aneurysm

Kodenko M.R., Makarova T.A.

Abstract

BACKGROUND: Artificial intelligence (AI) technologies are actively implemented in the processing and analysis of diagnostic medical images. The accuracy and reliability of AI algorithms are determined by the amount and quality of training data sets. Currently, a need exists for increased open access data sets, particularly abdominal aortic CT angiographic studies (CTA). Limitations of existing abdominal aortic CTA data sets are binary labeling (classification of the entire study) and small number of examinations. In addition, most examinations do not contain signs of aortic pathology, which, given its variability, significantly limits their use for AI training, since the target of such algorithms is the detection of pathology.

AIM: To prepare a CTA data set for patients with abdominal aortic aneurysm.

METHODS: Using the CTA data set with sings of abdominal aortic aneurysm, the stages and features of data set creation for AI training in accordance with the methodological recommendations were considered. Given the basic diagnostic requirements for the selected clinical task, the terms of reference for the preparation of the data set were formed, the required sample size was calculated, and the optimal annotation scenario was determined. The next stage included the selection of initial CT data of abdominal organs in the Unified Radiology Information System, anonymization of data, semi-automatic labeling and of the area of interest (aortic wall and aortic bed) using the 3D Slicer tool and its verification by an examining radiologist, and documentation of intermediate results.

RESULTS: The calculated sample volume included 100 scans, containing the arterial phase, with a slice thickness of up to 1.2 mm. The balance of “normal vs. pathology” classes was chosen to be 1:4. Partial annotation of the data (50%) was performed.

CONCLUSIONS: A methodology for preparing CTA data sets was developed. The generated dataset, if the necessary procedures are followed, will be placed in the public domain and may be used for training and testing AI algorithms and conducting scientific research.

Digital Diagnostics. 2023;4(1S):90-92
pages 90-92 views

Artificial intelligence ethics code in healthcare. Sustainability of artificial intelligence systems: Why do we talk about their impact on the environment?

Mikhailova A.A., Sharova D.E.

Abstract

Environmental problems have a tremendous impact on the entire world population, particularly on human health, which plays a leading role in individual well-being. Environmental pollution, according to some estimates, kills approximately 9 million people every year. The introduction of artificial intelligence (AI) systems in many areas has enormous potential in reducing human impact on the environment; however, such systems have negative effects. The potential of AI systems to improve healthcare is inextricably linked to the ethical challenges posed by the complexity of these systems and their impact on the lives and health of communities, patients, and staff. In addition to aspects that relate directly to the algorithms, data, and clinical application of AI systems, long-term risks exist that are not obvious at first glance. One of these risks is the negative impact of AI systems on the environment, which may harm human health indirectly. AI systems are more than software, having physical components that are necessary for their functioning, such as processors, memory, and sensors. The manufacture and the energy consumption of the components has a profound effect on the environment. One study showed that when a single AI algorithm is trained, carbon emissions may reach values corresponding to the total carbon emissions from five cars’ lifetime.

This study analyzes existing literature linking the development of AI systems, especially in healthcare, to their effects on the environment. The study is intended to complement the emerging AI Ethics Code for healthcare, specifically the principles of sustainability that will be included in this code.

The study concludes that the environmental impact of AI systems should be considered when formulating ethical standards for AI in healthcare. These standards must be considered during the development, testing, and application phases of AI systems. All the people involved in the creation and use of AI systems (developers, physicians, and regulators) must monitor the environmental impact and minimize the environmental consequences of such systems at all stages of their existence. This principle calls for minimizing negative impacts, improving the energy efficiency, and disposing physical components in strict compliance with current legislation. Moreover, the rapid development of AI systems and the ethical dilemmas require that solutions be proposed jointly and ethical standards be developed in a manner that is consistent and sensitive to emerging technologies.

Digital Diagnostics. 2023;4(1S):93-95
pages 93-95 views

Quality control of fat fraction quantification in magnetic resonance imaging: A two-center phantom study

Panina O.Y., Ignatyeva V.A., Monakhova A.A.

Abstract

BACKGROUND: Assessment of quantitative parameters using magnetic resonance imaging (MRI) is a relevant trend. Fat fraction (FF) calculation provides new opportunities for accurate diagnosis and will replace invasive methods such as biopsy in the future. Quantification will enable reliable dynamic monitoring and assessment of drug therapy. However, radiologists and clinical specialists must be confident in the accuracy and reliability of the quantitative measures.

AIM: To assess the accuracy of quantitative FF measurement using phantom simulation in the range of 0% to 60%.

METHODS: Emulsions of the “oil-in-water” type were chosen to simulate the objects of the study. Concentrations of vegetable oil-based emulsions were presented in the range of 0% to 60%. Tubes containing the emulsions were placed in a cylindrical phantom. Scans were performed on an Optima, MR450w 1.5 Tesla (GE) tomograph in Lava Flex mode and on an Ingenia, 1.5 Tesla (Philips) tomograph in DIXON mode. FF was determined by formulas using images in In-phase and Out-phase based on signal characteristics (FF=[In–Out]/2∙In∙100) and images weighted by Water and Fat data (FF=Fat/[Fat+water]∙100.

RESULTS: The accuracy of the fat percentage measurement with the DIXON technique was identical to that of the Lava Flex. The data of the measured fat concentration were systematically overestimated in relation to the target values by an average of 57.6% with an average absolute difference of 17.2%. In addition, an irregular underestimation in the range of 20% to 40% was detected.

CONCLUSIONS: Phantom simulation using direct oil-in-water emulsions allowed to control the performance of the Dixon sequences in quantifying the FF. For correct FF quantification, calculation from Water and Fat image data using the formula FF=Fat/(Fat+water)∙100 is preferable. Calculations based on In-phase and Out-phase images provide ambiguous results. The FF calculation in the Lava Flex and DIXON modes must be performed with a correction factor. The use of the phantom allows proper quality control and calibration of the MRI scanner and makes quantitative fat measurement widely available.

Digital Diagnostics. 2023;4(1S):96-98
pages 96-98 views

Learning radiologists’ annotation styles with multi-annotator labeling for improved neural network performance

Nikitin E.D.

Abstract

BACKGROUND: One of the common problems in labeling medical images is inter-observer variability. The same image can be labeled differently by doctors. The main reasons are the human factor, differences in experience and qualifications, different “radiology schools”, poor image quality, and unclear instructions. The influence of some factors can be reduced by proper organization of the annotation; however, the opinion of doctors frequently differs.

AIM: The study aimed to test whether a neural network with an additional module can learn the style and labeling features of different radiologists and whether such modeling can improve the final metrics of object detection on radiological images.

METHODS: For training artificial intelligence systems in radiology, cross-labeling, i.e., annotation of the same image by several doctors, is frequently used. The easiest way is to use labeling from each doctor as an independent example when training the model. Some methods use different rules or algorithms to combine annotation before training. Finally, Guan et al. use separate classification heads to model the labeling style of different doctors. Unfortunately, this method is not suitable for more complex tasks, such as detecting objects on an image. For this analysis, a machine learning model designed to detect objects of different classes on mammographic scans was used. This model is a neural network based on Deformable DETR architecture. A dataset consisting of 7,756 mammographic breast scans and 12,543 unique annotations from 19 doctors was used to train the neural network. For validation and testing, a dataset consisting of 700 and 300 Bi-Rads-labeled scans, respectively, was taken. In all data sets, the proportion of images with pathology was in the 15%–20% range. A unique index was assigned to each of the 19 doctors, and a special module at each iteration of the neural network training found a vector corresponding to this index. The vector was expanded to the size of the feature map of each level of the feature pyramid, and then attached by separate channels to the maps. Thus, the encoder and the decoder of the detector had access to the information about which doctor labeled the scan. The vectors were updated using the back-propagation method. Three methods were chosen for comparison:

  1. Basic model: Combining labels by different doctors using the “voting” method.
  2. New stylistic module: For predictions on the test dataset, a single doctor’s index was taken, which showed the best metrics on the validation dataset.
  3. New stylistic module: The indexes of the five doctors with the best metrics on the validation dataset were used for predictions on the test dataset. Weighted Boxes Fusion was chosen to combine the predictions.

The area under the receiver operating characteristic curve (ROC-AUC) was used as the primary metric on the test dataset (Bi-Rads 3, 4, and 5 categories were referred to pathology). The sum of maximum probabilities of detected malignant objects (malignant masses and calcinates) by cranio-caudal and medio-lateral oblique projections was assumed as the probability of malignancy for each method.

RESULTS: The following ROC-AUC metrics were obtained for the three methods: 0.82, 0.87, and 0.89.

CONCLUSIONS: The information about the labeling doctor allows the neural network to learn and model the labeling style of different doctors more effectively. In addition, this method may obtain an estimate of the uncertainty of the network’s prediction. The use of embedding from different doctors, leading to different predictions, may mean that this data is difficult for an artificial intelligence system to process.

Digital Diagnostics. 2023;4(1S):99-101
pages 99-101 views

Development of a portable spectrophotometer using artificial neural networks for non-invasive determination of glycated hemoglobin in blood by Raman spectroscopy

Poliker E.E., Zemskikh B.L., Koshechkin K.A.

Abstract

BACKGROUND: Non-invasive diagnosis of diabetes is one of the major problems of contemporary medicine. The system being planned could be a new technology for measuring hemoglobin A1c (HbA1c) accurately and non-invasively. Therefore, a series of studies are to be conducted to assess the efficiency of the method under study and determine its potential for medical diagnosis and monitoring of HbA1c.

AIMS:

  1. Investigation of the feasibility of Raman spectroscopy for non-invasive measurement of HbA1c.
  2. Development and design of a portable analyzer using this technology.
  3. Assessment of the efficiency and accuracy of the developed device.

METHODS: Neural network creation requires collecting a training sample of measurements for subsequent application of TensorFlow library tools and performing laboratory measurements to calibrate the system for determining HbA1c. The device will use a 785-nm laser to take spectra according to the Raman spectroscopy. The obtained data will be fed to the input of the neural network based on the architecture of convolutional neural networks. Experiments will be conducted to train the model to determine the accuracy and efficiency of the device. A two-step data collection procedure is planned. First, a preliminary test will be done on 50 patients to see how the proposed method handles different age and gender groups and different HbA1c levels. Later, the data will continue to be collected on a larger scale, including patients with different types of diabetes and healthy individuals. Data will be collected using a portable spectrophotometer and monitored by high-performance liquid chromatography. Various metrics will be used to assess the efficiency and accuracy of the device such as accuracy, precision, recall, and F1-score.

RESULTS: An analysis of the available literature was conducted and the following conclusions were drawn. In addition, a neural network model was developed using HbA1c measurements. Currently, our model is optimized to improve the accuracy and reliability of the results.

CONCLUSIONS: The non-invasive Raman spectroscopy-based method has several advantages in measuring HbA1c levels. The procedure is faster and non-traumatic, and HbA1c levels can be monitored continuously. In particular, the non-invasive method eliminates errors associated with protein leakage outside the bloodstream.

Digital Diagnostics. 2023;4(1S):102-104
pages 102-104 views

Complicated infectious endocarditis in a patient with human immunodeficiency virus: A case report

Potemkina T.V., Ylanov I.A., Petrova E.B.

Abstract

INTRODUCTION: Infectious endocarditis (IE) in injecting drug patients with human immunodeficiency virus (HIV) is manifested predominantly by damage to the tricuspid valve (TV). The pathogen of the disease is Staphylococcus aureus. The IE peculiarities of the TV in this category of patients are multiple septic emboli in the small circulation, which may result from flotation vegetations, and predominance of pulmonary symptomatology over cardiac phenomena.

CASE PRESENTATION: A 30-year-old female HIV-infected injecting drug user was dynamically monitored for the laboratory-confirmed IE development by transthoracic echocardiography during a year. The patient was twice admitted to the intensive care unit in a serious condition with purulent-septic complications in the lungs in the form of bilateral polysegmental destructive (septic) pneumonia confirmed by X-ray and multispiral computed tomography. After intensive therapy, the patient refused further ARV treatment and consultations with a cardiac surgeon. A clinical follow-up demonstrated IE of the TV and right-sided lower lobe pneumonia in an HIV-infected drug-dependent patient after a cesarean section. Immunodeficiency without appropriate ARV therapy had a negative impact on the course of the disease. According to transthoracic echocardiography, an increase in TV vegetations from 7 mm to 16 mm and regurgitation were observed, whereas left ventricular ejection fraction decreased from 60% to 47% during the follow-up. Complications of cesarean section, immunodeficiency, and absence of ARV therapy could be the trigger factors of the IE development. Injection drug use with possible violations of asepsis and circulation of microorganisms of the causative agents in the blood contributed to the rapid development of the disease and was a determining factor of the infectious process in the TV.

CONCLUSIONS: Echocardiography remains the primary radiological diagnostic method for examining HIV-infected drug-dependent patients with fever and/or after medical manipulations. However, this group of patients more frequently clinically manifests the disease with bright pulmonary pathology. Therefore, radiological methods should necessarily be a priority during the diagnostic search. The sources of septic embolism in the small circulation in IE may be loose and floating TV vegetations.

Digital Diagnostics. 2023;4(1S):105-107
pages 105-107 views

A chat-bot in rheumatoid arthritis treatment control

Prokofeva Y.A., Zheleznykh E.A., Menshikova I.V.

Abstract

BACKGROUND: Rheumatoid arthritis (RA) is an autoimmune rheumatic disease with joint damage and systemic manifestations, which worsens the quality of life and life expectancy, leading to disability in the absence of effective therapy at a young age. The goal of RA treatment is to achieve remission/low disease activity. Frequent monitoring of the disease is needed (every 1–3 months until the goal is reached, then every 3–6 months), which is not always possible due to remoteness of residence, financial capabilities of patients, and epidemic situation. Remote monitoring appears to be a possible solution to the problem; however, the effectiveness of telemedical technologies in the treatment of patients with RA is not sufficiently studied.

AIM: To investigate the effectiveness of remote-control treatment of patients with RA of high and moderate activity using a chat-bot.

METHODS: An algorithm for remote monitoring and communication with RA patients was developed. The chat-bot performs a survey every month and out-of-schedule when the patient’s condition worsens and provides the data to the doctor in a convenient form. Regular assessments of RA activity, functional impairment, and quality of life and correction of recommendations if necessary are made. All participants are coded, with only the doctor having access to personal data. In remote (60 patients) and traditional (30 patients) control groups, the time to remission/low disease activity will be compared. Adherence to the chat-bot and cost-effectiveness analysis will be studied.

RESULTS: Twenty patients were trained on how to use the chat-bot and have been using the program for 2 months. The condition is monitored and online counseling is provided if necessary. Nineteen patients had no difficulties when working with the chat-bot. One patient needed a second consultation on how to use the chat-bot. Half of the patients were over 60 years old. Most patients prefer remote counseling to a face-to-face appointment. Patients report an improved understanding of the disease, treatment principles, and methods of self-assessment of the joint condition. Remote monitoring is planned to achieve stable control of RA activity by timely detection of exacerbations and therapy correction and assessment of the need for hospitalization, which will help to reduce the period of remission/low RA activity. The economic cost of treating RA is expected to be reduced.

CONCLUSIONS: Remote monitoring using a chat-bot to improve the effectiveness of RA treatment is an important aspect of current rheumatology and a potential method for increasing the availability of medical care. The results may serve as a basis for further research on telemedical technologies and the development and application of personalized algorithms for monitoring, prevention, and treatment of patients with rheumatic diseases.

Digital Diagnostics. 2023;4(1S):108-110
pages 108-110 views

Ultrasonic elastographic and morphological features of fatty hepatosis

Rashidova K.A.

Abstract

BACKGROUND: Non-alcoholic fatty liver disease is a common chronic liver condition characterized by pathological accumulation of fatty droplets, which is not associated with alcohol consumption. The main reason in the development of complications and adverse outcomes of the disease is fibrotic changes in the liver, leading to cirrhosis.

AIM: To determ the informative value of two-dimensional shear wave elastography in hepatosis by a comparative analysis of morphological and ultrasound elastometric findings.

METHODS: The study included 40 patients aged 35–60 years. The control group consisted of 25 healthy people with a body mass index of 24–26. Among 40 patients, F1, F2 and F3 stages were detected in 15 (37.5%), 20 (50%), and 5 (12.5%) cases, respectively. The diagnosis was based on clinical, laboratory, and ultrasound examinations conducted with a Mindray Consona N9 device using a convex transducer at 2.0–3.5 MHz. In the absence of contraindications, all patients underwent puncture biopsy under ultrasound navigation in compliance with aseptic and antiseptic requirements.

RESULTS: At the first (F1) stage of hepatic fibrosis (n=15), the elastometry index averaged 5.4 (4.8–6.2) kPa, and the shear wave velocity was 1.1±0.2 m/s. Histomorphological examination in this group revealed mild fatty liver dystrophy, with liver tissue having varying degrees of dystrophic changes. In the second (F2) stage of fibrosis (n=20), the mean elastometry values were 6.9 (6.3–7.9) kPa, while the shear wave velocity increased to 1.5±0.2 m/s. In patients of this group, histological examination showed that moderate to large fatty dystrophy developed in hepatocytes. In the F3 stage (n=5), the elastometry index averaged 8.3 (8.1–13.5) kPa, and the shear wave velocity reached 1.7±0.2 m/s. In this case, hepatocytes with fatty dystrophy in the focus surrounded by a cluster of lipophages were determined. Coincidence of fibrosis stage determined by elastometry data with morphological examination of liver biopsy specimen was observed in 36 (90%) patients with fatty hepatosis.

CONCLUSIONS: Comparison of the results of two-dimensional shear wave elastography and morphological changes of liver parenchyma in hepatosis showed high (90%) correlation with the data of the above examinations. If puncture biopsy is contraindicated, shear wave elastography may serve as a valuable diagnostic method to clarify the stage of fibrosis in hepatosis.

Digital Diagnostics. 2023;4(1S):111-112
pages 111-112 views

Telemedical consultations on oncology in the Republic of Bashkortostan

Rustamkhanov R.A., Izmailov A.A., Aupov R.T., Rakhimov R.R., Halimov T.M.

Abstract

BACKGROUND: The COVID-19 worldwide pandemic enabled the expanded use of telemedical technologies in many areas of medicine. Remote consultations helped conserve medical resources and reduce the risk of spreading COVID-19 while preserving patients’ access to medical care. In addition, telemedicine played a role in caring for patients who live in remote regions. Other benefits include savings in transportation costs and travel time both for patients and caregivers. Telemedicine, together with remote health monitoring technologies, has high potential in developing a preventive healthcare system and increasing the accessibility of medical care and meets current challenges by improving healthcare quality and providing an individual approach to patients. In 2020, the Center of Telemedicine was created in the Republican Clinical Oncological Dispensary (RCOD) to organize and improve telemedical assistance to the population of the Republic of Bashkortostan in the oncology profile.

AIM: To analyze telemedical consultations (TMCs) on oncology in the Republic of Bashkortostan for the period of 2020–2022.

METHODS: Quantitative count and comparison of the TMCs conducted by the RCOD of the Ministry of Health of the Republic of Bashkortostan in 2020–2022 and sent to the National Medical Research Center (NMRC) were performed. The work on referrals to the NMRC for revision of examination results (computer tomography, magnetic resonance imaging, positron emission tomography/computed tomography, and histological examinations), obtaining a second opinion, and determining treatment tactics was organized.

RESULTS: In 2020, 32,076 TMCs were conducted, while 225 TMCs were performed with the NMRC. In 2021, the RCOD conducted 52,139 TMCs (a 62% increase compared to 2020), whereas 473 TMCs took place in the NMRC (a 110% increase compared to 2020). During the 12 months of 2022, 57,456 TMCs were performed by RCOD staff (a 10% increase over the previous year), and 672 TMCs were conducted with the NMRC (a 42% increase compared to 2021). For feedback from referring medical organizations and monitoring and evaluating the quality of regional TMCs, conference calls were held with the Ministry of Health of the Republic of Bashkortostan, chief physicians, and oncologists of the Republic of Bashkortostan.

CONCLUSIONS: TMCs allow for the rapid exchange of medical information, thereby reducing the time of diagnosis and timely prescription of treatment, the implementation of timely routing of patients and improving the quality and availability of medical care in the oncology profile in the Republic of Bashkortostan. The annual increase in the number of TMCs is due to the growing need for this type of specialized medical care in this profile.

Digital Diagnostics. 2023;4(1S):113-115
pages 113-115 views

The role of magnetic resonance imaging in efficacy of low-dose extracorporeal shock wave therapy for patients with knee osteoarthritis

Sevriugina O.A., Kulchitskaya D.B.

Abstract

Among many diseases of the joints, the most common is osteoarthritis and, in particular, knee osteoarthritis. Current medicine requires new and improved imaging techniques to assess patients with knee osteoarthritis, which enable early diagnosis, improved understanding of the pathophysiology of osteoarthritis, and the efficacy of the ongoing treatment. Scientific data on the use of magnetic resonance imaging (MRI) as an objective method to assess the impact of shock wave therapy (SWT) on the restoration of damaged cartilage and bone marrow in patients with knee osteoarthritis was analyzed. A search for publications in the PEDro and PubMed databases for the period from 2017 to 2022 was performed. The search was done using the following keywords: “osteoarthritis”/“knee osteoarthritis”, “shock wave therapy”, “magnetic resonance imaging”. Five foreign studies were included in the review as a result of the search (no Russian publications were available). Two studies analyzed the effects of SWT on altered cartilage in patients with knee osteoarthritis. Patients who received oral non-steroidal anti-inflammatory drugs were selected as a comparison group. The authors assessed SWT effects on cartilage using quantitative estimates of T2 relaxation time (T2 mapping) and the severity of bone marrow edema on MRI images. At 24 weeks after treatment, differences in relaxation time on T2-weighted MRI images of the patella, acetabulum, and medial and lateral articular surfaces of the femur and tibia showed no statistical significance compared to those before treatment (t= –1.859; P= 0.076). In conclusion, the authors suggested that the resulting effect of SWT in patients with knee osteoarthritis was due to the use of low energy and stated that research will continue using higher SWT parameters. Another study reported that patients with knee osteoarthritis showed a statistically significant reduction in the area of the subchondral bone marrow lesion 6 months after SWT. In addition, the authors found a correlation between the reduction in subchondral bone marrow lesion size and the improvement in pain scores resulting from the SWT treatment. In another study, MRI scans in patients with knee osteoarthritis documented a positive SWT effect by reducing bone marrow edema. After one year of follow-up, MRI images showed complete regression of bone marrow edema among patients who received SWT. The number of studies that investigated SWT effects on cartilage and bone marrow restoration in patients with knee osteoarthritis using MRI is limited, indicating the need for continued research in this area.

Digital Diagnostics. 2023;4(1S):116-118
pages 116-118 views

Intralobar pulmonary sequestration with a rare source of arterial supply

Vinokurov A.S., Smirnova A.D., Belenkaya O.I., Yudin A.L.

Abstract

BACKGROUND: Pulmonary sequestration is one of the most common malformations of the lungs in clinical practice. However, difficulties are possible in the interpretation of the radiological data, which leads to a violation of the examination technique in such patients and, accordingly, to the lack of success of the therapy and proper routing.

AIM: To demonstrate the clinical case of a patient with intralobar pulmonary sequestration, describing the characteristic radiographic picture, and suggesting research methodology for the identified features of the aberrant vessel.

METHODS: Clinical and radiological data of a 27-year-old patient with acute respiratory symptoms and suspected abscessed pneumonia based on X-ray and computed tomography (CT) findings were presented. Due to the absence of clinical and radiological dynamics, atypical CT semiotics of “abscesses”, CT angiography of the thoracic aorta was performed after intravenous contrast enhancement with 80 ml of iodine-containing preparation (350 mg/mL).

RESULTS: A pulmonary tissue thickening was revealed in the lower left lobe with lumpy clear contours, which consisted of a system of cystic cavities with contents, particularly well differentiated after contrast enhancement. On the native study, an additional vascular structure following from the subdiaphragmatic space was traced paravertebrally, which was the reason for extending the CT angiography scanning area to the epigastric region of the abdomen. A large-caliber arterial vessel was detected, which departed as a branch from the celiac trunk and passed to the above-described thickening of the pulmonary tissue. The combination of these signs is typical for intrapulmonary sequestration.

CONCLUSIONS: The correct interpretation of the identified changes allowed the patient to be routed to a hospital with a thoracic surgery department, since the sequestration must be removed in the vast majority of cases to prevent recurrent inflammatory episodes. Extension of the scanning area below the diaphragm may be useful, since part of the sequesters is supplied with blood from the abdominal aorta and its visceral branches. This will prevent the need for repeat CT angiography, and information about the source of the blood supply is extremely important for surgeons.

Digital Diagnostics. 2023;4(1S):119-121
pages 119-121 views

Artificial intelligence in the diagnosis of thoracic aortic aneurysms in a retrospective chest computed tomography scan analysis

Solovev A.V., Sinitsyn V.E., Petraikin A.V., Vladzymyrskyy A.A., Reshetnikov R.V.

Abstract

BACKGROUND: Aortic aneurysms, known as “silent killers”, are frequently asymptomatic, leading to vessel rupture and death. Annual rates for ruptures, stratifications, and sudden deaths are up to 3.6%, 3.7%, and 10.8%, respectively. Timely diagnosis and early treatment save a patient’s life. The use of artificial intelligence (AI) technologies helps to detect aortic aneurysms, which significantly improves the quality of diagnosis and saves patients’ lives.

AIM: To assess the efficiency of using AI technologies to detect thoracic aortic aneurysms on chest computed tomography (CT) and determining the possibility of using AI technologies as an assistant to the radiologist during the primary description of radiological images.

METHODS: The study retrospectively assessed the results of AI technologies aimed at detecting thoracic aortic aneurysms on chest CT scans. No contrast enhancement was performed primarily. The sample consisted of 84,405 observations of patients over the age of 18 years; of these, 86 scans with thoracic aortic aneurysms were selected according to AI data. The selected examinations were retrospectively assessed by radiologists and vascular surgeons for the probable presence of a thoracic aortic aneurysm. In 44 cases, an aortic aneurysm was initially detected by the radiologist. In 31 cases, an aneurysm was not initially described by the radiologist, 6 were excluded from the sample (due to the absence of the radiologist’s report in the Unified Radiological Information Service), and 5 scans had false-positive results according to AI findings.

RESULTS: The use of AI technologies allows detection and labeling of pathological changes in the aorta on the images. AI technologies increase the detectability of thoracic aortic aneurysms in the description of chest CT scans by 38.8%. The incidence of ascending aortic aneurysm was 0.3%, which corresponded to the literature data of 0.16%–1.6%. According to the results, 22 surgical interventions for aortic stenting were performed.

CONCLUSIONS: The use of AI in the primary chest CT description may help increase the detectability of clinically significant pathological conditions, such as thoracic aortic aneurysm. Further development of routing for this category of patients in the cito mode for surgical treatment is relevant. Expansion of retrospective screening by chest CT scans using AI systems will improve the quality of diagnosis of concomitant pathologies and prevent adverse outcomes for patients.

Digital Diagnostics. 2023;4(1S):122-124
pages 122-124 views

Computed tomography in the diagnosis of oncopathology in end-stage renal disease: A case report

Tanirkhanova E.Z., Zhussupbekova L.I., Turebekov D.K., Zhakeyeva B.K., Baimukanova T.T., Zhantugan A.

Abstract

BACKGROUND: In recent years, an increasing tendency of oncopathology in patients with chronic kidney disease (CKD) was observed. Clinical data demonstrate an increased risk of malignization in patients with decreased renal function. The cohort study (2022) reported a cumulative incidence of cancer in nephrology patients ranging from 10.8% to 15.3%. A high percentage of stage IV cancers were detected in patients with CKD at the time of diagnosis. In 2022, the American Association for Cancer Research published the results of a Mendelian Randomization Study examining the causal relationship between CKD and the risk of developing 19 local cancers, including renal cell cancer, cervical cancer, leukemia, and colorectal cancer. Several studies found a direct correlation between a decreased glomerular filtration rate and the development of oncopathologies. Therefore, cancer awareness is important in the management of patients with CKD. In patients with end-stage chronic renal disease (ESRD) who are on hemodialysis, X-ray diagnosis with iodine-containing radiopaque agents is possible without additional risk of kidney damage.

AIM: To demonstratу the role of computed tomography (CT) in the diagnosis of oncopathology in a patient with CKD to attract the attention of physicians to the importance of using advanced diagnostic techniques in patients with CKD.

METHODS: A clinical case of a 32-year-old patient M. who was hospitalized in the Therapeutic Department of Multidisciplinary City Hospital No. 2 in Astana was presented.

RESULTS: A patient with ESRD resulting from chronic glomerulonephritis in a hypertensive form complained of dyspnea at rest, cough with difficult sputum, right thoracic pain, general weakness, and weight loss of 8 kg in 1 month. Past medical history showed that the patient was on alternate program hemodialysis for 4 years. Deterioration occurred within 3 months. The patient was examined at the place of residence. CT scan showed signs of tuberculosis of the upper right lobe (?) and lymphadenopathy of intrathoracic and axillary lymph nodes. A neoplasm was not excluded. The patient was consulted by a phthisiatrician, GeneXpert sputum was performed, and tuberculosis was excluded. In dynamics, ultrasound was conducted due to increasing dyspnea. Fluid accumulation in the pericardial and pleural cavities was detected. A pulmonologist assessed the situation as uremic pericarditis, pleurisy on the right side, and right-sided pneumonia in the upper lobe of unclear genesis. Antibacterial therapy was prescribed. Due to a significant deterioration of the condition, the patient went to the city hospital. At admission, respiratory failure, pain syndrome in the chest area, and marked asthenization up to cachexia were observed. Ultrasound of pleural cavities showed free fluid in the pleural cavity on the right (770 ml) and left (110 ml), whereas abdominal ultrasound revealed cavernous hemangiomas of the liver (?), echogenic suspension of the gallbladder, and splenomegaly. Echocardiography showed diffuse hypokinesis of all left ventricular walls. Grade 1–2 pulmonary hypertension was detected. Systolic function of the left ventricle was moderately decreased. Effusion in the pericardial cavity in the volume of 430 ml and congestion in the inferior vena cava were found. A patient with ESRD was on program hemodialysis for 4 years, which allowed the use of contrast-enhanced X-ray imaging techniques without the risk of additional renal damage. Contrast-enhanced chest CT showed pronounced right-sided pleurisy. Given the presence of foci of contrast agent accumulation in the structure of the parietal pleura, malignancy was not excluded (mesothelioma?). Indolent left-sided pleurisy, segmental and subsegmental compression atelectasis of the right lung, distinct edema and thickening of interlobular septa of both lungs, and single dense foci of I/II, III segments of the left lung up to 4.2 mm in diameter were detected. In addition, chronic bronchitis, pericarditis, and lymphadenopathy of subclavian, intrathoracic, and axillary lymph nodes up to 15.0 mm in diameter (malignancy not excluded) were revealed. Osteosclerosis foci of the Th3 vertebral body measuring 4.7×5.1 mm was observed. Contrast-enhanced abdominal and retroperineal CT scan showed a focal mass of the IVa segment of the liver measuring 17.3×15.9×16.4 mm (malignancy not excluded), chronic calculous cholecystitis, chronic pancreatitis, lymphadenopathy of intra-abdominal para-aortic and mesenteric lymph nodes up to 18.0 mm in size (malignancy not excluded), reduced size of both kidneys (contracted kidneys), and a cystic mass in the left ovary measuring 39.4×42.0×34.5 mm (3–5 HU). Patient was consulted by an oncologist: pleural mesothelioma? Metastasis in the liver? Consultation with a thoracic surgeon to decide on morphological verification was recommended. A biopsy was planned at the place of residence; however, morphological verification of oncopathology was not performed due to the patient’s lethal outcome.

CONCLUSIONS: This clinical case of a patient with ESRD on hemodialysis demonstrates the importance of contrast-enhanced CT to diagnose oncopathology.

Digital Diagnostics. 2023;4(1S):125-128
pages 125-128 views

Ultrasound diagnostics in the assessment of traumatic peripheral nerve damage in combat trauma

Tatarina A.V., Dubrovskikh S.N., Gumerova E.A.

Abstract

BACKGROUND: Traumatic peripheral nerve damage is a significant clinical and social problem, which is characterized by a high level of disability in young patients.

AIM: To assess the diagnostic efficiency of ultrasound in the diagnosis of peripheral nerve damage in combat trauma.

METHODS: A total of 163 patients (362 peripheral nerves) were examined. The duration of traumatic nerve damage was 2–273 days. All patients were men aged 20–48 years. Ultrasound was performed with 7–17 MHz linear transducers on an ACUSSON S2000 device using standard technique in B-mode, in longitudinal and transverse scanning planes, with the use of Doppler techniques. Statistical analysis was conducted to assess diagnostic efficiency. Calculation of operational (sensitivity and specificity) and integral (accuracy) characteristics was performed by the qualitative assessment of the reference method (surgical intervention) and the method under study (ultrasound).

RESULTS: Peripheral nerve damage resulted from combat trauma. In 120 (73.6%) cases, injuries of the limbs were accompanied by injuries of the osteoarticular apparatus and vessels. A total of 274 (75.7%) nerves had signs of traumatic damage. Multiple nerve injuries were observed in 95 (58.3%) people. Nerves of the upper extremities were damaged more frequently (185 [67.5%]) compared to nerves of the lower extremities (89 [32.5%]). Contusional structural changes were observed in 181 (66%) nerves. Impairment of anatomical integrity was diagnosed in 46 (16.8%) nerves, while complete impairment was found in 29 (10.6%) cases with the presence of diastasis between the nerve ends. Early after injury, a wound canal and hematomas were visualized near the nerve. In 4 cases, a foreign body of metallic density was visualized in the nerve sheath. After 3 weeks from the moment of injury, terminal neuromas were observed. The neuroma sizes for the proximal and distal ends were 0.5×0.3 to 1.6×0.6 cm and 0.4×0.2 to 1.3×0.6 cm (avascular), respectively. Adjacent sections of the nerve over 3–5 cm were thickened and characterized by echo structure, however, with thickening of all fasciculi and blood flow observed along the periphery of the nerve. Marginal nerve damage was observed in 17 (6.2%) people. In case of marginal neuroma, a significant nerve thickening of 1.4–3.2 times over a short distance (from 0.4 cm to 1.5 cm) with loss of bundle differentiation of the part of the nerve, pronounced decrease in echogenicity, and absence of Doppler signal was detected. Nerve compression in 47 cases (17.1%) was accompanied by 1.2–2.3 times thickening of nerve trunks, indistinct contours, decreased echogenicity, and significant changes in the nerve structure. Compression was due to cicatricial changes, hematomas, foreign bodies, bone fragments, and — in 2 cases — spokes from external fixation devices. A total of 106 patients underwent surgery.

CONCLUSIONS: The ultrasound sensitivity and specificity were 96% and 67%, respectively. The peculiarities of the examination included extensive soft tissue defects and external fixation devices, which significantly complicated the examination. The diagnostic accuracy was 91%. A pronounced cicatricial process (70%) was the main cause of false-positive (6.6%) and false-negative (2.8%) results.

Digital Diagnostics. 2023;4(1S):129-132
pages 129-132 views

Medical scientific conferences and social networks: How Russian physicians share professional knowledge?

Alfimov А.Е., Trofimova А.А., Matvienko А.А., Kodalaeva М.V.

Abstract

BACKGROUND: Physicians who attend international conferences cover their content on social media. Such posts generate an active response and discussion in the comments involving other physicians. Attending all conferences when they are held simultaneously is impossible; therefore, brief communications that capture the essence of a missed presentation are in demand, generate an immediate response, and quickly raise awareness of new clinical research and scientific data. This phenomenon was not studied in Russia. However, the posts were analyzed and the activity and interest among Russian physicians were evident.

AIM: To investigate how frequently Russian physicians use available social networks to share information from scientific conferences with their colleagues.

METHODS: The search for posts for the last 4–12 months in Russian social networks such as VKontakte (vk.com), VrachiRF (vrachirf.ru), and Doctor na rabote (doktornarabote.ru) by “report”, “conference”, “congress”, “symposium”, and “medical conference” keywords was conducted. The selected recordings were classified into 6 categories (conference announcements; reports of past conferences without disclosing the content; professional journalistic reports, disclosing the content; reports from physicians, disclosing the content; videos of reports with disclosure; videos of reports without disclosure) and counted (1373 posts in total). However, the category “Reports from physicians revealing the content of some selected parts of the report and facts and ideas presented in the report” was given special attention due to useful information from the conferences and a reason to discuss in the comments. In addition, relevant studies by authors from other countries were analyzed and compared with our results.

RESULTS: A total of 1,373 posts (searched by keywords), of which 65 were in the category “Reports from physicians revealing the content of some selected parts of the report and facts and ideas presented in the report” was reviewed. The number of such posts is limited; however, this information is of interest to physicians (high number of views and dozens of comments). By comparison, the number of such messages in other countries may reach into the hundreds at a single conference alone. Based on foreign experience, the discussion of the reports on social networks helps both to spread new knowledge and facilitate joint learning and interaction among physicians, which contributes to the generation of useful material that passed peer review. Possible reasons for the low number of such posts on Russian social networks are as follows: mostly messages and discussions take place on professional social networks (VrachiRF and Doctor na rabote), foreign organizers actively encourage participants to use social networks with conference hashtags, and the multimillion-speaking English-speaking audience encourages authors to write more posts with their feedback.

CONCLUSIONS: Physicians quite rarely share facts presented at Russian scientific medical conferences on Russian social networks. However, users of social networks show considerable interest and actively discuss such posts. The study of this phenomenon will enable the assessment and effective use of its educational potential.

Digital Diagnostics. 2023;4(1S):133-137
pages 133-137 views

Software for brain tumor diagnosis on magnetic resonance imaging

Tuchinov B.N., Letyagin A.Y., Amelina E.V., Amelin M.E., Pavlovskiy E.N., Golushko S.K.

Abstract

BACKGROUND: The main reason for the development and implementation of artificial intelligence (AI) technologies in neuro-oncology is the high prevalence of brain tumors reaching up to 200 cases per 100,000 population. The incidence of a primary focus in the brain is 5%–10%; however, 60%–70% of those who die from malignant neoplasms have metastases in the brain. Magnetic resonance imaging (MRI) is the most common method for primary non-invasive diagnosis of brain tumors and monitoring disease progression. One of the challenges is the classification of tumor types and determination of clinical parameters (size and volume) for the conduct, diagnosis, and treatment procedures, including surgery.

AIM: To develope a software module for the differential diagnosis of brain neoplasms on MRI images.

METHODS: The software module is based on the developed Siberian Brain Tumor Dataset (SBT), which contains information on over 1000 neurosurgical patients with fully verified (histologically and immunohistochemically) postoperative diagnoses. The data for research and development was presented by the Federal Neurosurgical Center (Novosibirsk). The module uses two- and three-dimensional computer vision models with pre-processed MRI sequence data included in the following packages: pre-contrast T1-weighted image (WI), post-contrast T1-WI, T2-WI, and T2-WI with fluid-attenuated inversion-recovery technique. The models allow to detect and recognize with high accuracy 4 types of neoplasms, such as meningioma, neurinoma, glioblastoma, and astrocytoma, and segment and distinguish components and sizes: ET (tumor core absorbing Gd-containing contrast), TC (tumor core) = ET + Necr (necrosis) + NenTu, and WT (whole tumor) = TC + Ed (peritumoral edema).

RESULTS: The developed software module shows high segmentation results on SBT by Dice metric for ET 0.846, TC 0.867, WT 0.9174, Sens 0.881, and Spec 1.000 areas. The testing and validation were done at the international BraTS Challenge 2021 competition. The test dataset yielded DiceET 0.86588, DiceTC 0.86932, and DiceWT 0.921 values, placing the developed software module in the top ten. According to the classification, the results demonstrate high accuracy rates of up to 92% in patient analysis (up to 89% in slice analysis), a very high potential, and a perspective for future research in this area.

CONCLUSIONS: The developed software module may be used for training specialists and in clinical diagnostics.

Digital Diagnostics. 2023;4(1S):138-140
pages 138-140 views

X-ray signs of congenital diaphragmatic hernias in term newborns

Khanaliyeva N.F., Garayeva S.Z.

Abstract

BACKGROUND: Imaging plays a major role in the initial diagnosis, treatment, and subsequent assessment of congenital diaphragmatic hernias. Chest X-ray is still of great importance in newborns due to the availability and relative ease of use.

AIM: To reveal radiological signs determining congenital diaphragmatic hernias in term newborns.

METHODS: The study was conducted at the K. Faradzheva Research Institute of Pediatrics. The study group consisted of 7 term newborns with diaphragmatic hernias. All children underwent chest X-ray. The comparison group included 18 children without congenital anomalies of the respiratory system.

RESULTS: Congenital diaphragmatic hernias, which occur during intrauterine development, were found in term newborns in our study. Hernia of the diaphragmatic esophagus is more common in newborns. Hernia of the diaphragm is the second most frequent, while hernias of the anterior diaphragm in newborns are extremely rare. The bronchus was visualized in 50% of term newborns with diaphragmatic hernias (χ2=27.329; p <0.001). Impaired diaphragmatic integrity was visualized in all term patients with diaphragmatic hernias and in 20% of those with congenital anomalies (p <0.001). In the same patients, X-ray showed the stomach and/or intestinal loops in the thoracic cavity.

CONCLUSIONS: The radiological picture of a diaphragmatic hernia is characterized by a decreased lung volume, impaired visualization of the bronchi, impaired diaphragmatic integrity, impaired clarity of diaphragmatic contours, and the presence of stomach/intestinal loops in the thoracic cavity.

Digital Diagnostics. 2023;4(1S):141-142
pages 141-142 views

Discrimination of artificial intelligence in healthcare

Khomyakov M.Y.

Abstract

Currently, artificial intelligence (AI) plays an important role in various fields as a primary worker or assistant, especially in healthcare. AI has many functions that can be performed even better than humans do due to the high speed of compiling a large amount of data from various sources (Internet and electronic health records), which increases the productivity of doctors. Less discussed, though equally important, is the discrimination of AI in healthcare. Doctors, who have a lot of responsibility, cannot rely on AI due to multiple vulnerabilities. First, AI collects huge amounts of data. However, AI does not guarantee error-free results, despite its non-autonomy and operator control, since human factors can play a role, becoming a source of inaccuracy. Therefore, a high risk of using poor quality data in further decision-making processes exists. Errors, biases (ethnic, gender, age, and social), and data gaps worsen AI outcomes, leading, for example, to discrimination against minorities and inaccurate prescriptions. In addition, AI may act unethically or even violate laws (e.g., Title VI, Section 1557 of the Affordable Care Act, which prohibits discrimination by race, color, national origin, sex, age, or disability in certain healthcare programs and activities).

Secondly, AI may be called secretive due to the indeterminacy of the algorithms. This means that no one can explain how or why the AI reached this or that decision, as stated by Judea Pearl in The Book of Why: The New Science of Cause and Effect. Therefore, doctors cannot check the facts and make sure that the analysis is done correctly and the conclusion is accurate. Difficulties in solving real-world problems using AI that cannot be solved by formal and mathematical rules of logic as humans do (e.g., natural language and face recognition) must be recognized. AI makes the work of medical professionals easier, however, posing many unresolved problems that mislead doctors and contribute to wrong decisions.

Digital Diagnostics. 2023;4(1S):143-144
pages 143-144 views

Electrocardiographic patterns of autonomic dysfunction in the diagnosis of autonomic neuropathy in patients with type 2 diabetes mellitus

Sharov S.A., Usanova A.A.

Abstract

Type 2 diabetes mellitus poses a serious threat to the health of people worldwide. Despite active detection and stringent measures to control and treat diabetes, the condition leads to a variety of complications, including autonomic neuropathy, resulting in autonomic cardiac denervation associated with an increased risk of painless myocardial ischemia and sudden cardiac death. However, digital verification by finding electrocardiographic (ECG) patterns of autonomic dysfunction is possible.

The available literature on ECG patterns of myocardial electrical instability, which reflect autonomous myocardial dysfunction, was summarized. A literature review of scientific papers on ECG diagnosis of autonomic myocardial dysfunction in patients with type 2 diabetes mellitus over the past 5 years was performed using PubMed and eLIBRARY data.

Among different ECG patterns that reflect autonomic dysfunction, the most common is the investigation of heart rhythm variability, which is based on the mathematical analysis of respiration rate intervals. The simplest variables are used to obtain a series of statistical indicators such as SDANN, RMSSD, NN50, and pNN50. A new and understudied ECG pattern of autonomic dysfunction is heart rate turbulence (HRT), which is a short-term rhythm change that develops in response to a ventricular extrasystole. The extrasystole is followed by a short episode of sinus tachycardia lasting several cardiac cycles, which is followed by a longer episode of bradycardia. These heart rate fluctuations are based on baroreflex compensation of intracardiac hemodynamic changes. Two parameters are estimated to characterize the HRT: turbulence onset and turbulence slope. A specific marker of autonomic dysfunction is the rate of cardiac rhythm recovery after controlled exercise. A recovery rate of <12 beats per first minute was associated with an increased risk of all-cause mortality, whereas a reduction in recovery rate of <40 beats per 2 min was found to be a strong independent risk factor for all-cause mortality.

An imbalance in the tone of sympathetic and parasympathetic systems underlies all the described indicators. Therefore, a risk-stratifying significance of autonomic dysfunction markers in a wide range of pathologies, including peptic ulcer disease, gallstone disease, hypertension, chronic heart failure, chronic obstructive pulmonary disease, bronchial asthma, thyreopathies, and anemias apart from type 2 diabetes mellitus, exists. This explains the high sensitivity of tests, while having a low positive predictive value and specificity. The ease of performing tests dictates the need for further study of the features of autonomic dysfunction markers in patients with type 2 diabetes mellitus, since these markers are associated with a high risk of painless myocardial ischemia and sudden cardiac death.

Currently, several ECG patterns (heart rate variability, HRT, and heart rate recovery rate) reflect autonomous myocardial dysfunction. The patterns enable early detection of autonomous neuropathy in patients with type 2 diabetes mellitus, which will allow timely diagnosis and adequate therapy. However, further study is required due to their low specificity to identify the peculiarities in specific nosological forms.

Digital Diagnostics. 2023;4(1S):145-147
pages 145-147 views

Ways to improve the efficiency of implementing artificial intelligence systems in medical practice

Shmonova M.A., Avacheva T.G.

Abstract

BACKGROUND: The medical market offers interesting solutions that use artificial intelligence (AI) technologies; however, such solutions often remain at the startup level or are used locally. The question is how to achieve the maximum when introducing AI systems into medical practice.

AIM: To answer the question of why the large number of existing developments in AI and medical decision support systems are not used as widely as medical information systems, telemedical consultations, and other health IT solutions. Possible ways to improve the efficiency of implementing AI technologies and medical decision support systems in the work of physicians were presented.

METHODS: Theoretical and general scientific (analysis of literature and Internet sources on the problem of research, synthesis, generalization, comparison, and systematization) and empirical (observation, interview, and testing) methods were used.

RESUTLS: The main barriers to the effective implementation of AI systems in medical practice and possible options to solve the following problems were highlighted.

  • Problem 1: incorrect data collection. Solution: care must be taken with the accumulation of materials used for the analysis and training by AI systems in medicine.
  • Problem 2: incompetent developers. Solutions: involvement of effective third-party specialists or training one’s own.
  • Problem 3: medical workers’ and/or patients’ aversion to AI technologies. Solutions: education in the successful application of AI technologies and medical decision support systems in healthcare and involvement of practicing physicians as experts during the AI conceptualization.

CONCLUSIONS: If the above criteria for the development and use of AI technologies and medical decision support systems are met, the effect of their introduction into medical practice will tend to be maximized.

Digital Diagnostics. 2023;4(1S):148-150
pages 148-150 views


This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies