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由于对传导束枝的解剖学、电生理学的了解,心电图图式的特点,对于三束枝传导系统在室内单独或联合的传导障碍是可以诊断的,所以左束枝左前分枝阻滞或左前半分枝阻滞(L A H)与左束枝左右分枝阻滞或左后半分枝阻滞(L P H)可单独存在,上二者任何一枝亦可与右束枝传导阻滞(R B B B)同时存在,故 LAH 伴有 R B B B 与 LPH 伴有 RBBB 皆代表为双束枝传导阻滞。与此相似左束枝传导阻滞也是一个类型的双束枝传导阻滞,很明显在双束枝传导阻滞中,房室传导除了经过正规的房室结与希氏束传导系统外,
Due to the anatomical, electrophysiological understanding of the bundle branch, the electrocardiogram pattern, the conduction defect can be diagnosed indoors alone or in combination with the three bundle branch system, so left bundle branch left anterior branch block or left front Left and right branch block or left hemicycle branch block (LPH) can exist independently in both LAH and RBBB, Therefore, LAH accompanied by RBBB and LPB associated with RBBB are represented by double-bundle branch block. Similarly, left bundle branch block is also a type of double bundle branch block, it is clear that in the double bundle branch block, atrioventricular conduction in addition to pass through the normal atrioventricular node and His bundle conduction system,