FEATURES OF HEART RATE REGULATION IN ADOLESCENTS WITH ESSENTIAL HYPERTENSION

Cardiointervalography is an important method of analyzing the regulation of heart rate variability, which allows evaluating the balance of the entire spectrum of humoral-metabolic and vegetative effects, both in condition of physiological rest and in various functional tests. It is noted that in hypertensive patients, in most cases, there is a chronic predominance of ergotrophic metabolic reactions that reflect the system tension in the regulatory mechanisms. The aim of our study was to conduct a comparative analysis of the features of the mechanisms of heart rate regulation in adolescents with confirmed essential hypertension and their healthy age mates. Material and methods. The study involved 50 adolescents (12–16 years of age) – 26 boys and 24 girls with labile essential hypertension (EHT) and stage 1 HT on the background of the standard medical correction of blood pressure (enalapril 0,58 mg/kg per day). Each participant of the study and control group underwent recording of at least 512 cardio cycles in the state of physiological rest in a sitting position, as well as registration of blood pressure. Results and discussion. We have found that for adolescents with EHT a significantly lower (by 15 %) average duration of the heart cycle is typical in combination with a decrease in the variation range, which indicates some rigidity of the heart rate regulatory mechanisms. The relative decrease in the proportion of high-frequency spectrum components in comparison with the low-frequency and very low-frequency ranges in adolescents with hypertension also indicated a tendency to predominance of sympathicotonic effects with the predominant involvement of the structures of the diencephalic region and the brain stem. At the same time blood pressure inversely correlated with the index of the variation range of cardiointervals, reflecting the lower adaptive potential of the heart rate regulation mechanisms. Conclusion. We have found regular changes in the regulation of heart rate in adolescents with hypertension, that can be taken as markers of its progressive development and used by clinicians to develop more personalized approaches to medication treatment

The influence of walking in an exoskeleton on rehabilitation of patients with spinal cord injury consequences

Objective: to substantiate the expediency of including training walking in an exoskeleton in the complex rehabilitation of patients with severe motor dysfunctions of the lower limbs due to spinal cord injury (SCI).Methods: 120 patients (84 men and 36 women, age 37.1 ± 8.40 years) with the consequences of SCI at the level of thoracic and lumbar spine who were in the hospital at the second stage of medical rehabilitation were examined. The duration of injury ranged from 1 year to 19 years (77.8 ± 4.05 months). All patients were divided into two groups (80 and 40 patients), comparable by sex, age, duration and severity of injury. Training walking in exoskeleton have been added in the group I rehabilitation program. ASIA, SCIM III scales and SF-36 quality of life questionnaire were used to evaluate the effectiveness of the rehabilitation measures.Results: there was an increase in the total score on SCIM III by 3.20 ± 0.50 (p = 0.05) in group I, which indicates an increase in the level of functioning and daily activity of patients. Positive dynamics was revealed when assessing the quality of life using SF-36 questionnaire: sum index reflecting the psychological component of health increased from 56,0 to 59,5 points (p = 0,05). Group II also showed positive dynamics of the analyzed indicators, but the changes by the end of the rehabilitation course were not statistically significant.Conclusion: the use of exoskeleton training walking at the second stage of medical rehabilitation increases the effectiveness of rehabilitation measures and improves the quality of life of patients with severe motor dysfunctions of the lower limbs due to spinal cord injury (SCI)

Эффективность КВЧ-терапии при цитостатической депрессии кроветворения

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Russian clinical practice guidelines «congenital adrenal hyperplasia»

Congenital adrenal hyperplasia (CAH) is a group of autosomal recessive diseases characterized by a defect in one of the enzymes or transport proteins involved in the cortisol synthesis in the adrenal cortex. The most common form of CAH, which occurs in more than 90% of cases, is a 21-hydroxylase enzyme deficiency. The latter is subdivided into nonclassical and classic (salt-losing and virilizing) forms. The prevalence of classic forms of 21-hydroxylase deficiency ranges from 1: 14,000 to 1:18,000 live births worldwide. According to the data of neonatal screening in the Russian Federation, the prevalence of the disease in some regions ranges from 1: 5000 to 1: 12000, in the country as a whole - 1: 9638 live newborns. The non-classical form of CAH occurs more often - from 1: 500 to 1: 1000 among the general population. In second place is the hypertensive form of CAH - a deficiency of 11β-hydroxylase, which, according to the literature, occurs in about 1 per 100,000 newborns. These clinical guidelines were compiled by a professional community of narrow specialists, approved by the expert council of the Ministry of Health of the Russian Federation, and updated the previous version published in 2016. The clinical guidelines are based on systematic reviews, meta-analyses and original articles, and scientific work on this issue in the Russian Federation and other countries. The purpose of this document is to provide clinicians with the most up-to-date, evidence-based guidelines for the CAH diagnosis and treatmen

Клинико-функциональная оценка интрамиокардиальной имплантации аутологичных клеток костного мозга, обработанных эритропоэтином, в хирургии ИБС (6-месячные результаты)

Aim. Clinical and functional evaluation of the implantation of autologous bone marrow cells treated with erythropoietin in laser channels during coronary bypass grafting in patients with end-stage coronary lesion.Materials and methods. 60 patients with coronary artery disease with diffuse and (or) distal right coronary artery disease were randomized into two groups: patients of group 1 (n = 30) underwent coronary bypass grafting, implantation of autologous bone marrow cells treated with erythropoietin in laser channels, patients of the 2nd group (n = 30) were operated with coronary bypass grafting of the left coronary artery system. Assessment of the clinical status, myocardial perfusion and contractility was performed initially, 6 months after the operation.Results. Six months after the operation, there was a more pronounced decrease in angina pectoris (CCS) in the main group compared to the control group, also we revealed a 6-minute walk test scores improvement. Based on two-stage scintigraphy (Tc99) in the main group before the surgical treatment, a rest perfusion defect was 8.5% [3.5, 18.5], a stress-induced perfusion defect – 7.0% [6.0, 12, 3]. In the control group, the rest defect was 9.1% [5.6, 12.4], the stress-induced perfusion defect was 7.3% [6.1, 8.7]. 6 months after surgery rest perfusion defect at the indirect revascularization group was 6.0% [2.5, 16.5] (p = 0.008), a stress-induced defect was 4.0% [1.5, 6.3] (p = 0.05). In the control group, the rest defect was 8.7% [5.3, 10.3], the stress-induced perfusion defect was 6.8% [5.3, 9.1] (p = 0.21). The results of scintigraphy with MIBG showed a left ventricle innervation defect (PID) significant decrease in the main group: initially 15.4% [14.2, 16.3], after 6 months 11.7% [9.3, 13, 2] (p = 0.045). In the control group, there was an unreliable decrease in PID: initially 14.3% [10.2, 17.3], after 6 months 13.8% [9.1, 14.2] (p = 0.14).Conclusion. Our preliminary results revealed more pronounced effect of the new indirect revascularization method expressed as in myocardial perfusion improve, myocardial sympathetic innervation restoration and clinical status improvement in comparison with control group.Цель. Клинико-функциональная оценка эффекта применения трансмиокардиальной лазерной реваскуляризации в сочетании с имплантацией прекондиционированных эритропоэтином клеток аутологичного костного мозга в хирургии ишемической болезни сердца.Материалы и методы. Больные ИБС с диффузным и(или) дистальным поражением правой коронарной артерии (n = 60) рандомизированы на две группы: пациентам 1-й группы (n = 30) выполнено коронарное шунтирование, c имплантацией прекондиционированных эритропоэтином клеток аутологичного костного мозга в область нижней стенки левого желудочка, пациентам 2-й группы (группа контроля, n = 30) выполнено коронарное шунтирование системы левой коронарной артерии. Оценка клинического статуса, перфузии и сократительной способности миокарда выполнена исходно, через 6 месяцев после операции.Результаты. Через 6 месяцев после операции выявлено более выраженное снижение функционального класса (ФК) стенокардии (ССS) в основной группе по сравнению с группой контроля, улучшение показателей теста 6-минутной ходьбы. По результатам двухэтапной сцинтиграфии миокарда с технетрилом (Тс99) М в основной группе до хирургического лечения отмечен стойкий дефект перфузии 8,5% [3,5; 18,5], стресс-индуцированный дефект перфузии 7,0% [6,0; 12,3]. В контрольной группе – стабильный дефект 9,1% [5,6; 12,4], стресс-индуцированный дефект перфузии 7,3% [6,1; 8,7]. Через 6 месяцев в основной группе стойкий дефект перфузии составил 6,0% [2,5; 16,5] (p = 0,008), стресс-индуцированный дефект – до 4,0% [1,5; 6,3] (p = 0,05). В контрольной группе – стабильный дефект 8,7% [5,3; 10,3], стресс-индуцированный дефект перфузии 6,8% [5,3; 9,1] (р = 0,21). Результаты сцинтиграфии с МIBG демонстрируют значимое уменьшение площади дефекта иннервации (ПДИ) в сегментах нижней стенки левого желудочка в основной группе: исходно 15,4% [14,2; 16,3], через 6 месяцев 11,7% [9,3; 13,2] (р = 0,045). В контрольной группе выявлено недостоверное уменьшение ПДИ: исходно 14,3% [10,2; 17,3], через 6 месяцев 13,8% [9,1; 14,2] (р = 0,14).Заключение. Исследование продемонстрировало улучшение перфузии в зоне непрямой реваскуляризации, восстановление симпатической иннервации миокарда, лучшие показатели ФК (CCS), теста 6-минутной ходьбы у пациентов в основной группе

Identifying key questions in the ecology and evolution of cancer

The application of evolutionary and ecological principles to cancer prevention and treatment, as well as recognizing cancer as a selection force in nature, has gained impetus over the last 50 years. Following the initial theoretical approaches that combined knowledge from interdisciplinary fields, it became clear that using the eco‐evolutionary framework is of key importance to understand cancer. We are now at a pivotal point where accumulating evidence starts to steer the future directions of the discipline and allows us to underpin the key challenges that remain to be addressed. Here, we aim to assess current advancements in the field and to suggest future directions for research. First, we summarize cancer research areas that, so far, have assimilated ecological and evolutionary principles into their approaches and illustrate their key importance. Then, we assembled 33 experts and identified 84 key questions, organized around nine major themes, to pave the foundations for research to come. We highlight the urgent need for broadening the portfolio of research directions to stimulate novel approaches at the interface of oncology and ecological and evolutionary sciences. We conclude that progressive and efficient cross‐disciplinary collaborations that draw on the expertise of the fields of ecology, evolution and cancer are essential in order to efficiently address current and future questions about cancer

Phase Equilibria of the In–Pd–Sn System at 500 °C and 800 °C: Experimental Study and CALPHAD Modeling

Phase equilibria in the In–Pd–Sn system were investigated by a combination of key experiments and thermodynamic modeling. Partial isothermal sections at 500 °C and 800 °C of the In–Pd–Sn system for Pd contents above 66 at.% have been plotted experimentally using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDX) and X-ray diffraction (XRD). The solubility of the third component in binary compounds InPd3 and Pd3Sn was determined. The new ternary compound τ1 was found in Pd contents ranging from 20 to 25 at.% and at Sn contents varying from 5 to approximately 17 at.% Sn. This compound crystallizes in an Al3Ti-type tetragonal structure. Isostructural InPd2 and Pd2Sn phases from the In–Pd and Pd–Sn binary compositions form a continuous phase field in the ternary system at both temperatures. The temperatures of the solidus, liquidus, and phase transitions of the alloys along the Pd–In50Sn50 line were measured using DTA/DSC. Thermodynamic calculation of the In–Pd–Sn ternary system is performed using the CALPHAD method using the Thermo-Calc® software. The thermodynamic properties of the disordered fcc and liquid phases were described by the Redlich–Kister–Muggianu model. To describe intermetallic phases, namely, InPd3, Pd3Sn, τ1 and Pd2(InxSn1−x), a two-sublattice models was used. Thermodynamic description of the In–Pd–Sn system obtained in this study is in good agreement both with our results and the published experimental dat