本文复习心脏正常电活动的基础,讨论心律失常的机理,评价现有临床技术鉴别这些机理的价值和限度。本文采用Hoffman和Cranefield的心律失常分类法,即冲动形成异常、传导异常或两者共同引起的心律失常。正常电活动大多数心脏特殊传导系统和心肌细胞的膜电位低于-80mV,窦房结、房室结和房室瓣细胞的膜电位则高于-70mV。静息膜电位是动作电位类型的主要决定因素。例如,刺激具有较高膜电位的特殊传导系统或心肌纤 This review of the basis of normal cardiac electrical activity, discuss the mechanism of arrhythmia, evaluation of existing clinical techniques to identify the value of these mechanisms and limits. In this paper, Hoffman and Cranefield arrhythmia classification, impulse formation abnormalities, abnormal conduction, or both cause arrhythmia. Normal electrical activity The membrane potential of most cardiac conduction systems and cardiomyocytes is lower than -80 mV, and the membrane potential of the atrial node, atrioventricular node and atrioventricular valve cells is higher than -70 mV. Resting membrane potential is the main determinant of action potential type. For example, a special conduction system or cardiomyocyte with a higher membrane potential is stimulated