1981～1985年,我院12,909份心电图中发现心脏电交替6例,检出率约为5(?)。笔者对此6例进行了临床观察与心电监测,发现一般常见或罕见类型电交替的发生及消失与心搏频率密切相关,故本文称之为频率依赖性电交替(简称频电交替)。鉴于至今尚缺专门从频率的角度来研究这一问题,特结合本组资料就心脏电交替的发生条件、分型与命名、诊断与鉴别诊断等方面进行探讨。临床与心电图资料例1,女,52岁,平静心电图示心肌缺血,拟诊冠心病?图1系阵发室上速持续3天转复前、后及平静时Ⅱ导联描记。上三条依次示心 From 1981 to 1985, 12,909 electrocardiograms in our hospital found that cardiac electrocardiogram alternated in 6 cases, the detection rate was about 5 (?). The author of these 6 cases of clinical observation and ECG monitoring and found that common or rare type of alternating occurrence and disappearance of heart rate and heart rate are closely related, so this article is called frequency-dependent alternating electricity (referred to as alternating frequency). In view of the lack of special frequency from the perspective of the study of this issue, especially combined with this group of information on the occurrence of cardiac alternation, typing and naming, diagnosis and differential diagnosis and so on. Clinical and electrocardiographic data example 1, female, 52 years old, tranquil ECG showed myocardial ischemia, diagnosis of coronary heart disease? Figure 1 Department of paroxysmal supraventricular tachycardia for 3 days before, after and when transected Ⅱ lead description. Followed by the three heart