The clinical application of thiazolidinediones has an almost 12 year history. The correction of carbohydrate metabolism achieved by the treatment with hiazolidinediones is associated with the reduction of many risk factors of coronary heart disease and the improvement of prognosis for the patients presenting with type 2 diabetes mellitus. The possible mechanisms underlying complications encountered in the clinical practice in connection with the use of thiazolidinediones are discussed.

В настоящее время доказано, что гипогликемия является независимым фактором риска сердечно-сосудистых событий у больных сахарным диабетом. В статье рассматриваются потенциальные механизмы воздействия гипогликемии на сердеч-но-сосудистую систему и вопросы самоконтроля гликемии при сахарном диабете.Ключевые слова: сахарный диабет, гипогликемия, сердечно-сосудистый риск, контроль гликемии. О.А.SHATSKAYA, PhD in medicine, S.S. KUKHARENKO, PhD in medicine Endocrinology Scientific Center of the Ministry of Health of Russia, MoscowGlycaemia self-control role in prevention of cardiovascular diseases in diabetes mellitus patients Currently glycaemia is proved to be an independent risk factor of cardiovascular events in diabetes mellitus patients. The article considers potential hypoglycaemia action mechanisms on the cardiovascular system and glycaemia self-control issues in diabetes mellitus.

Type 1 diabetes mellitus (T1DM) triggers disruption of oxygen transport system in patients. The maximum oxygen consumption (VO2 max) during spiroergometry depends on the functional capabilities and composition of the body. Moreover, VO2 max may be considered a predictor of pathological changes in cardiovascular system.Aim. The purpose of the study was to investigate the compositional body characteristics and functional cardiorespiratory parameters in T1DM patients.Material and Methods. The study comprised 30 patients with T1DM (average age of 25.5 ± 8.1 years) and 10 patients of control group (average age of 27 ± 9 years). Patients received spiroergometry examination according to B. Bruce protocol and bioimpedansometry using the Inbody 770 apparatus. The study showed that T1DM patients reached anaerobic threshold faster (p = 0.032) and had significantly lower VO2 max and carbon dioxide emission compared to patients without diabetes (p = 0.021; p = 0.034) whereas exercise tolerance did not significantly differ compared with the corresponding value in control group. Patients with higher muscle mass i.e. muscle tissue weight (kg) according to bioimpedance measurements had higher values of VO2 max (L) in control group (p = 0.017) and in group of T1DM patients (p = 0.028).Conclusions: Young T1DM patients without cardiovascular diseases had significantly less effective cardiorespiratory system compared with that in people without diabetes even in those with high exercise tolerance. Rapid achievement of anaerobic threshold with preserved performance efficiency was a sign of unfavorable prognosis. Body mass index and lean body mass did not significantly affect the performance parameters in young T1DM patients. Screening of spiroergometry parameters may be used for identification of young T1DM patients at high risk of unfavorable cardiovascular diseases including chronic heart failure.

Aim. To identify the indicators of cardiac magnetic resonance (CMR), which have diagnostic value in the individual assessment of the cardiovascular prognosis in young patients with type 1 diabetes mellitus (T1DM).Material and Methods. The study included a total of 60 patients (29 men and 31 women) aged 18 to 36 years with a history of T1DM from 5 to 16 years, who underwent contrast-enhanced CMR. Circular strain, strain relaxation index (SRI), peak early diastolic strain rate (SRe), epicardial fat thickness (EFT), ejection fraction (EF), stroke volume (SV), end-diastolic volume (EDV), end-systolic volume (ESV), and left ventricular mass (LVM) were assessed. Echocardiography, 24-h electrocardiography (ECG), treadmill test, and NT-proBNP blood test were performed to exclude heart pathology. Statistical data processing was used to identify the relationships of changes in CMR parameters of the left ventricle and epicardial adipose tissue with disease duration, carbohydrate metabolism compensation (HbA1c), total cholesterol, and low-density lipoprotein (LDL).Results. Using the nonparametric Mann – Whitney U-test, the study showed the presence of significant differences in the values of SV, EDV, end-diastolic volume index (EDVI), and LVM in the groups of 5–10and 11–16-year duration of disease, respectively. The assessment of Spearman’s rank correlation coefficients revealed negative correlations between the values of SV, ESV, ESV index (ESVI), EDV, and LVM and T1DM duration; between the index of circular strain and blood level of HbA1c; between the values of SV, EDVI, ESVI, EDV, ESV, and LVM and blood levels of total cholesterol and LDL; between SV, EDVI, ESVI, EDV, ESV, and LVM and mean EFT in the left ventricular projection.Conclusion. The CMR-based evaluation of strain parameters may become a key in personalized identification of young T1DM patients with a high risk of adverse cardiovascular events. The thickness and distribution of epicardial adipose tissue in young patients with T1DM may have predictive value for risk stratification of developing diseases associated with atherosclerosis and chronic heart failure, which will affect the primary prevention strategy in this population.