Aim. To study the myocardial morpho-functional abnormalities, the incidence and nature of cardiac arrhythmias in patients 3 months after the coronavirus disease 2019 (COVID-19).Material and methods. The study included 77 patients (mean age, 35,9 years) treated for coronavirus infection, which underwent echocardiography and 24-hour Holter monitoring 3 months after COVID-19. The patients were divided into 3 groups: group 1 — 31 patients with upper respiratory tract involvement; group 2 — 27 patients with bilateral pneumonia (CT grade 1, 2), 3 — 19 patients with severe pneumonia (CT grade 3, 4). Statistical processing was carried out using Statistica 10.0.Results. According to echocardiography, the peak tricuspid late diastolic velocity and isovolumetric contraction time in all groups increased (P<0,001). The tricuspid and mitral Em/Am ratio decreased depending on the disease severity. In group 3, the right ventricular and atrial size increased (P<0,001). The pulmonary artery systolic pressure, left atrial volume in patients of the 2nd and 3rd groups was higher than in the control one (P<0,001). In group 1 and 2 patients, the regional strain in basal and basal/middle segments decreased, respectively, while, in group 3, not only regional but also global left ventricular (LV) strain decreased (P<0,001). In all groups, cardiac arrhythmias and pericardial effusion were found. The relationship was established between coronavirus activity and the structural and functional myocardial parameters (P<0,001).Conclusion. Cardiovascular injury 3 months after COVID-19 was found in 71%, 93%, and 95% of patients with mild, moderate and severe course. In mild course patients, a decrease in regional myocardial strain in LV basal segments, signs of past pericarditis, and various cardiac arrhythmias were noted. In patients of moderate severity, these changes were more pronounced and were accompanied by an additional decrease in regional strain in LV middle segments, impaired right ventricular diastole and increased pulmonary artery pressure. In severe patients, in addition to the above changes, dilatation of the right heart and inferior vena cava was recorded, as well as LV diastolic and global systolic function decreased.

Aim. Based on the autopsy data, to analyze mortality patterns of the Zabaykalsky Krai population over a three-year period in the group of out-of-hospital sudden cardiac death (SCD).Material and methods. The protocols of deceased persons without evidence for violent death were analyzed with distribution into groups depending on age, sex and cause of death. Descriptive statistics were used for statistical processing.Results. The leading positions (58% of cases) in mortality patterns are occupied by various types of coronary artery disease (CAD). Chronic coronary syndromes were detected in 21%, cardiomyopathy — in 11%, decompensated heart failure — in 7%, myocarditis — in 1% of cases. Acute types of CAD were found in 68,4% in men and 31,6% in women. Among men, the number of such cases increases from 31 to 70 years of age and decreases over 70 years old. Among women, there is an increase in the SCD prevalence in the group over 70 years old.Chronic coronary syndromes were found in 46,4% in men and 53,6% in women. In both groups the number of cases increases with age. The maximum sex differences are observed in the group over 70 years old. The mean age for men is 72,2±8,8 years, for women — 77,2±10,4 years. Blood alcohol was detected in 10,2% of cases. The mean age of the deceased in all age groups of persons with identified blood alcohol was 66,2±12 years.In 1,89% of cases, I46 code (ICD-10) was established. The largest number of deaths among persons of both sexes was registered in the group of 31-40 years old, accounting for 36,8% among men and 13,2% among women. The mean age of the deceased was 35,8±8,4 years. In 28,6% of cases, ethyl alcohol was found in the biological media of the deceased in this group.Conclusion. Acute and chronic types of CAD make a significant contribution to out-of-hospital mortality. The number of SCD in men is higher than in women and is directly proportional to the age increase, reaching a maximum in the group over 70 years old. Ethyl alcohol, an important trigger of SCD, was detected in 10,8% of SCD cases in 2017, and in 15% in 2018 and 2019.

Aim. To study the structural and functional cardiac changes and arrhythmias in patients with type 1 diabetes (T1D) complicated with ketoacidosis.Material and methods. We analyzed 24-hour Holter monitoring data in 112 patients with T1D complicated with diabetic ketoacidosis (DKA). To assess the left ventricular (LV) diastolic function, all patients underwent echocardiography.Results. In patients with T1D complicated with DKA, the following cardiac arrhythmias were recorded: supraventricular arrhythmias — 60,7%, premature ventricular contractions — 26,2%, premature ventricular and supraventricular contractions — 13,1%. In 30% of patients with T1D complicated with DKA, premature ventricular contractions were classified as class 4A, in 10% — class 4B. With severe DKA, 5% of patients had short runs of unstable ventricular tachycardia. As the severity of ketosis increases, myocardial remodeling and LV diastolic dysfunction are recorded, as well as the spectral and temporal parameters of heart rate variability decrease.Conclusion. In patients with T1D complicated with DKA, structural and functional LV abnormalities, the development of LV diastolic dysfunction and cardiac arrhythmias are more often recorded. The most pronounced changes were found in the group of patients with T1D with moderate and severe DKA.

Тяжелое течение COVID-19, сопровождаемое острой дыхательной недостаточностью, острым респираторным дистресс-синдром и полиорганной недостаточностью, наиболее часто наблюдается у пожилых (старше 65 лет), а также у сравнительно молодых пациентов с сопутствующими заболеваниями -сахарным диабетом, гипертонической болезнью, нарушениями сердечной, почечной или печеночной деятельности. При этом у больных возникает чрезмерная воспалительная реакция, которая сопровождается развитием «цитокинового шторма», разбалансированием и последующим истощением Т-клеточного иммунитета. Успешная терапия COVID-19 строится на восстановлении функций поврежденной иммунной системы, в том числе ликвидации «цитокинового шторма». С этой целью рекомендовано применение блокатора рецептора моноклонального антитела к IL6 (RIL6) тоцилизумаба (TCZ). Приведены сведения об успешном применении TCZ у больных тяжелой формой COVID-19, а также указаны его существенные недостатки -развитие неблагоприятных реакций -лимфоцитопении, тромбоцитопении, увеличения уровня IL6, аланин-и аспартатаминотрансферазы и др. Одновременно приведены обоснования для применения у таких больных иммуномодулятора тималина, способного ликвидировать «цитокиновый шторм», а также нормализовать состояние иммунной системы и предотвращать синдром диссеминированного внутрисосудистого свертывания. Приводятся типичные случаи лечения больных с тяжелыми формами COVID-19 при использовании на фоне стандартной терапии TCZ и тималина раздельно и совместно.

Aim of the study. To study genetic polymorphisms rs10798 KCNQ1, rs3010396 CASQ2, rs20455 KIF6, rs2298566 SNX19, rs12143842 NOS1AP of subjects who died due to sudden cardiac death in Trans-Baikal Territory. Material and Methods. Over the period of 2017-2020, a total of 2211 autopsy protocols of subjects who died due to SCD were analysed. Th ese patient constituted the 1st study group (n=113). The control group consisted of healthy volunteers (n=70). The groups were comparable in age and gender. Molecular and genetic typing of the studied genes was performed. Results. The CC genotype of the single-nucleotide polymorphism rs3010396 CASQ2 showed statistical signifi cance in comparison with the control group(the chi-squared=26.95, df=2, p=0.001). The TT genotype was predominant in the control group amounting to 60% against 19.5% in the study group. Single-nucleotide polymorphism rs2298566 of gene SNX19 was also observed to be of statistical significance in the group of subjects who died from myocardial infarction. In the group of patients with SCD, rs20455 KIF6 and rs12143842 NOS1AP were of signifi cance along with rs3010396 CASQ2. Conclusion. Single-nucleotide polymorphism rs3010396 of the CASQ2 gene can be a predictor of sudden cardiac death, since in the 1st study group with this genotype showed its statistical signifi cance in all nosological groups. However, in the group, in which sudden cardiac death (cases coded I46.1 according to ICD-10) was indicated as the fi nal diagnosis, in addition to their statistical signifi cance single-nucleotide polymorphisms of the gene KIF6 rs20455, rs12143842 NOS1AP gene were noted; in the group where the cause of death was myocardial infarction, rs2298566 SNX19 gene polymorphism had statistical signifi cance. The results obtained make it possible to consider these polymorphisms as possible predictors of sudden cardiac death in the population of the Trans-Baikal Territory.