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一、激动产生异常所致的心律失常可分为两类 1.自律性心律失常。(1)正常机制:自律细胞可在无外来刺激的情况下自动而有规律地发放激动。心肌细胞的这种生理学性能称为自律性。这与自律细胞在4相内具有自发性舒张期除极有关。在正常心脏窦房结的自律性最高(因其4相除极速度最大)。因而潜在起搏点在除极到达阈电位以前。即
First, the abnormal arrhythmias caused by excitement can be divided into two categories: 1. Arrhythmia. (1) normal mechanism: self-regulatory cells in the absence of external stimuli automatically and regularly issued excitement. This physiological property of cardiomyocytes is called self-discipline. This is related to autonomous spontaneous diastolic depolarization in 4-phase cells. Sinus node in the normal heart of the highest self-discipline (because of its 4-phase depolarization speed). The potential pacemaker is therefore before the depolarization reaches the threshold potential. which is