抗心律失常药物的致心律失常作用可分为3类:(1)延长QT时限,致多形性室性心动过速(尖端扭转型室速);(2)将单纯室性过早搏动(室早)或非持续型室性心动过速(室速)转为持续型室速;(3)将心律失常由偶发转为频发或重复而不间断(incessant).程序 Antiarrhythmic drugs induced arrhythmia can be divided into three categories: (1) to extend the QT time limit, caused by polymorphous ventricular tachycardia (torsades de pointes VT); (2) will be simple ventricular premature beats Ventricular tachycardia) or non-sustained ventricular tachycardia (VT) to continuous VT; (3) the arrhythmia from sporadic to frequent or repeated incessant procedures