自William于1887年发现并提出心脏电活动的折返现象以来,折返一直是快速性心律失常发生的重要机制。传统观点认为折返的发生均为0相折返,即折返环路上的电传导只能是0相去极化时的电位差,即相邻细胞的去极化传播只能由0相电压差引起。直到1991年,国际著名的心电生理专家Antzelevitch首次证实并提出2相折返的概念。[定义]2相折返是一种功能性折返,是指在缺 Reentry has been an important mechanism of tachyarrhythmia since William discovered and proposed the reentry of cardiac electrical activity in 1887. The traditional view that the occurrence of reentry are 0 phase reentry, that reentrant loop electrical conduction can only be 0-phase depolarization potential difference, that is, adjacent cells depolarization propagation can only be caused by the 0-phase voltage difference. Until 1991, Antzelevitch, an internationally renowned electrophysiologist, first confirmed and proposed the concept of 2-phase reentry. [Definition] 2 phase return is a kind of functional reentry, refers to the lack of