ВЫЯВЛЕНИЕ И ДИСПАНСЕРНОЕ НАБЛЮДЕНИЕ ДЕТЕЙ С СИНДРОМОМ УДЛИНЕННОГО ИНТЕРВАЛА QT

Aim To assess the diagnostic accuracy of long QT syndrome in children and to estimate the results of the follow-up.Methods High-risk groups of children with bradycardia less than the second percentile and/or a family history of sudden death syndrome, and children with syncope diagnosed with the ECG testing were included in the study. All patients underwent routine medical examination, molecular genetic testing and were followed-up for 3,5–10 years.Results The majority of children haves transient corrected QT prolongation secondary to therapy, requiring ECG monitoring. High-risk group screening reports higher rates of idiopathic LQTS. ECG testing shows its efficiency among asymptomatic children with a normal heart rate. Patients present with syncope at the outpatient settings require the exclusion of a wide range of diseases, both congenital and acquired heart disease. The clinical status of the examined patients does not always correspond to the known LQTS variants. Molecular genetic analysis provides relevant information on the genetic heterogeneity of the disease, including new mutations, both pathological and beneficial ones.Conclusion Regardless of the presence or absence of molecular genetic confirmation of LQTS, beta blocker therapy in some cases combined with implanted cardioverterdefibrillator prevents the development of the adverse events in the long-term period and ensures normal emotional, intellectual and physical development.Цель Изучить эффективность диагностики синдрома удлиненного интервала QT (СУИQT) у детей и результаты наблюдения детей по данным катамнеза.Материалы и методы Проведено обследование детей двух групп риска – новорожденных с брадикардией менее 2 перцентиля и семейным анамнезом внезапной смерти, и детей с синкопе с помощью ЭКГ-скрининга, комплексного обследования выделенных групп, и наблюдение детей в течение 3,5–10 лет .Результаты Установлено, что в периоде новорожденности значительная часть детей имеет преходящее вторичное удлинение корригированного QT, что требует ЭКГ-контроля после лечения. Обследование детей из групп риска имеет большую вероятность выявления пациентов с идиопатическим СУИQT, тогда как у бессимптомных детей с нормальной частотой сердечного ритма выявление больных возможно только при проведении ЭКГ-скрининга. У пациентов с синкопе на амбулаторном этапе обследования необходимо исключение широкого спектра заболеваний, включая врожденные и приобретенные болезни сердца. Клинический статус наблюдаемых больных не всегда соответствует известным вариантам СУИQT.Заключение Независимо от наличия или отсутствия молекулярно-генетического подтверждения диагноза терапия бета-адреноблокаторами, и в ряде случаев ее сочетание в комбинации с имплантированным кардиовертером-дефибриллятором обеспечивает в течение длительного времени клиническую стабильность пациентов, удовлетворительные темпы эмоционального, интеллектуального и физического развития, предотвращает развитие сердечных событий с неблагоприятным исходом

CRYOBALLOON ABLATION IN RUSSIAN SITES OF INTERVENTIONAL ATRIAL FIBRILLATION MANAGEMENT TREATMENT: RESULTS OF THE FIRST NATIONWIDE SURVEY

Aim. The results of cryoballoon ablation (CBA) are known from the studies performed in the experienced centers of catheter treatment of atrial fibrillation (AF). The current study presents the results of CBA in real practice in centers with various experienceMaterial and methods. Among 62 Russian sites performing catheter treatment of AF, in 15 the CBA methods were in use to isolate pulmonary veins, in the years 2012-2014. Centers staff were surveyed for the detailed description of all performed CBA till 10.2014. The questionnaire included 74 lines about the centers experience, patients properties and ablation procedures, management of patients and complications. At the second step the questionnaire was used about complications.Results. Thirteen centers provided full data on all patients with CBA (457 procedures; 94% for paroxysmal AF; >95% CBAs in Russia). Six centers were marked as highly experienced for CBA for AF (mean 414,2±339,4 ablations for AF per year), and 7 — with lesser experience (33,2±34,3 ablations for AF per year). Ten centers provided the results of 6/12 month observation, and 11 centers — detalization of the complications data. there were no statistically significant differences in arrhythmia absence in patients from both types of centers (61,9±10,0 versus 61,3±30,4%). Serious complications developed in 1,5% of patients (4 tamponades, 2 strokes and 1 diaphragmal nerve palsy) and were similarly spread among more and less experienced centers (1,4% vs. 2%, p>0,05). Minor adverse events (vascular, transient diaphragm nerve palsy, transient hemoptysis) were found in 37 (8%) patients and were more common in more experienced (teaching) centers. Overall frequency of adverse events and of vascular events was higher in females than males (12% and 4,9% vs. 6% and 0%, resp.; p<0,05).Conclusion. In the real clinical practice CBA is performed with acceptable efficacy and moderate frequency of adverse events development. In less experienced centers of catheter treatment of AF the prevalence of serious adverse events does not differ from less experienced. Women develop vascular complications more often

Ventricular arrhythmias. Ventricular tachycardias and sudden cardiac death. 2020 Clinical guidelines

Russian Society of Cardiology (RSC).With the participation of Russian Scientific Society of Clinical Electrophysiology, Arrhythmology and Cardiac Pacing, Russian Association of Pediatric Cardiologists, Society for Holter Monitoring and Noninvasive Electrocardiology.Approved by the Scientific and Practical Council of the Russian Ministry of Health

ACHIEVEMENT OF DIMENSIONAL ACCURACY OF LENGTH VARIABLE THICKNESS STRIP AT ROLLING

It is established that the process of symmetrical rolling is accompanied by high metal pressure on the rolls, which leads to wear on their working surface. To reduce the metal pressure, the tension of the strip ends is applied. With a minimum forward tension, the deformation conditions are realized in the case of a discrepancy between the circumferential speeds of the working rolls. It is determined that the precision of products depends on the amount of advance and this must be taken into account when rolling with variable reduction. An equation for determining the instantaneous advance of the metal in the cross section of the exit from the deformation center during the rolling of profiles of variable cross section with increasing compression is presented. It has been theoretically proved that in order to reduce tool wear and to achieve the specified dimensional accuracy of the rolling profile, it is quite sufficient to roll the strip in the last pass with a minimum unit reduction of not more than 0,5 mm