АВТОМАТИЯ СЕРДЦА: ФИЗИОЛОГИЧЕСКИЕ МЕХАНИЗМЫ, РЕГУЛЯЦИЯ И КЛИНИЧЕСКОЕ ЗНАЧЕНИЕ.

Аннотация

The automatization of the heart is its fundamental ability to independently generate electrical impulses that initiate heart contractions, without external stimulation from the nervous system. This review is devoted to a comprehensive review of this phenomenon. The main driver of the rhythm is normally the sinoatrial (CA) node, whose cells have unique electrophysiological properties, in particular, the ability to slow spontaneous diastolic depolarization (phase 4 of the action potential). This process is based on the complex dynamics of ion currents, including the "funny" current (If), calcium currents (ICa,T, ICa,L) and potassium currents (IK). The review examines in detail the ionic mechanisms of pacemaker activity, the hierarchy of pacemakers (CA node, atrioventricular node, Gis-Purkinje system) and the phenomenon of suppression of the underlying centers of automatism (overdrive suppression). The mechanisms of regulation of heart rate by the autonomic nervous system (sympathetic and parasympathetic), humoral factors (adrenaline, thyroid hormones) and other influences (temperature, ion balance, hypoxia) are highlighted. The clinical significance of automation is discussed, including pathological conditions such as CA node dysfunction (sinus node weakness syndrome), ectopic foci of automatism, atrial and ventricular arrhythmias associated with abnormal automation, as well as approaches to their diagnosis (ECG) and treatment (antiarrhythmic drugs, artificial pacemakers). In conclusion, modern research directions in this field are considered, including the study of the genetic basis of automatism disorders and the development of biological rhythm drivers. Keywords: Heart automation, sinoatrial node, atrioventricular node, pacemaker, pacemaker cells, pacemaker potential, spontaneous diastolic depolarization, ion channels, funny current (If), calcium channels, potassium channels, autonomic nervous system, chronotropic effect, arrhythmias, sinus node weakness syndrome, ectopic rhythm, electrocardiography (ECG). Annotatsiya. yurakning avtomatizatsiyasi-bu asab tizimining tashqi stimulyatsiyasisiz yurak qisqarishini boshlaydigan elektr impulslarini mustaqil ravishda ishlab chiqarishning asosiy qobiliyatidir. Ushbu sharh ushbu hodisani har tomonlama ko'rib chiqishga bag'ishlangan. Ritmning asosiy haydovchisi odatda sinoatrial (CA) tugun bo'lib, uning hujayralari noyob elektrofiziologik xususiyatlarga ega, xususan, sekin o'z-o'zidan diastolik depolarizatsiya qobiliyatiga ega (harakat potentsialining 4-bosqichi). Ushbu jarayon ion oqimlarining murakkab dinamikasiga asoslangan, shu jumladan" funny " oqimi (If), kaltsiy oqimlari (ICa, T,ICa, L) va kaliy oqimlari (IK). Sharhda yurak stimulyatori faoliyatining ion mexanizmlari, ritm haydovchilarining ierarxiyasi (sa tuguni, atrioventrikulyar tugun, Gis- Purkinje tizimi) va avtomatizmning asosiy markazlarini bostirish fenomeni (overdrive 1 45 3 International scientific journal ISSN: 2181-3906 «MODERN SCIENCE АND RESEARCH» 2025 VOLUME 4 / ISSUE 5 / UIF:8.2 / MODERNSCIENCE.UZ suppression) batafsil ko'rib chiqilgan. Avtonom asab tizimi (simpatik va parasempatik), gumoral omillar (adrenalin, tiroid gormonlari) va boshqa ta'sirlar (harorat, ion muvozanati, gipoksiya) tomonidan yurak ritmini tartibga solish mexanizmlari yoritilgan. Avtomatlashtirishning klinik ahamiyati, shu jumladan CA tugunining disfunktsiyasi (kasal sinus sindromi), avtomatizmning ektopik o'choqlari, g'ayritabiiy avtomatizatsiya bilan bog'liq atriyal va qorincha aritmiyalari, shuningdek ularni tashxislash (EKG) va davolash usullari (antiaritmik dorilar, sun'iy yurak stimulyatori) kabi patologik holatlar muhokama qilinadi. Xulosa ushbu sohadagi zamonaviy tadqiqot yo'nalishlarini, shu jumladan avtomatizm buzilishlarining genetik asoslarini o'rganish va biologik ritm haydovchilarini ishlab chiqishni ko'rib chiqadi. Kalit so'zlar: yurak avtomatizatsiyasi, sinoatrial tugun, atrioventrikulyar tugun, yurak stimulyatori, yurak stimulyatori hujayralari, yurak stimulyatori potentsiali, o'z-o'zidan diastolik depolarizatsiya, ion kanallari, Funny oqimi (If), kaltsiy kanallari, kaliy kanallari, avtonom asab tizimi, xronotrop ta'sir, aritmiya, kasal sinus sindromi, ektopik ritm, elektrokardiografiya (EKG). Аннотация. Автоматия сердца – это его фундаментальная способность самостоятельно генерировать электрические импульсы, которые инициируют сердечные сокращения, без внешней стимуляции со стороны нервной системы. Данный обзор посвящен всестороннему рассмотрению этого феномена. Основным водителем ритма в норме является синоатриальный (СА) узел, клетки которого обладают уникальными электрофизиологическими свойствами, в частности, способностью к медленной спонтанной диастолической деполяризации (фаза 4 потенциала действия). В основе этого процесса лежит сложная динамика ионных токов, включая "funny" ток (If), кальциевые токи (ICa,T, ICa,L) и калиевые токи (IK). В обзоре детально рассматриваются ионные механизмы пейсмекерной