临床心电图中经常遇到室内差异性传导、功能性束支阻滞与室性激动的鉴别诊断问题。对此,各种心电图专著中都会列出十几条或更多的鉴别标准与方法,但多数特异性很差。一组心搏中第二现象则是鉴别两者的又一方法。 Clinical ECG often encounter indoor differential conduction, functional bundle branch block and ventricular activation differential diagnosis. In this regard, a variety of ECG monographs will list a dozen or more identification criteria and methods, but most of the poor specificity. A second group of heartbeat is to identify another method of both.