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近来,随着电生理的进展,发现一类束支传导阻滞与心率的快、慢有密切关系。每当心率增速或减慢到一定数值时即出现束支或分支传导阻滞图形,而心率中速时,心室内传导正常,传导阻滞图形消失,这叫做心率依赖型束支传导阻滞。因其与电生理的3.4位相有关,故又叫位相型束支传导阻滞。当心率增快时出现束支或分支传导阻滞称3位相性束支传导阻滞或心动过速性束支传导阻滞;当心率减慢时出现束支或分支传导阻滞称4位相性束支传导阻滞或心动过缓性束
Recently, with the progress of electrophysiology, found a bundle branch block and heart rate fast, slow are closely related. Whenever the heart rate growth or slow down to a certain value that beam bundle or branch block graphics, and the heart rate at moderate speed, normal ventricular conduction, conduction block diagram disappeared, which is called heart rate dependent bundle branch block . Because of its electrophysiological 3.4 phase, it is also known as phase-type bundle branch block. When the heart rate increases when the bundle branch or branch conduction block called 3-phase bundle branch block or tachycardia bundle branch block; when the heart rate slowed down when the bundle branch or branch block, said 4 phase Bundle branch block or bradycardia bundle