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当心脏发生完全性左束支传导阻滞时,心室除极的最早激动改从右室心内膜开始。或从室间隔的右室面开始,指向室间隔的左侧,或从右室游离壁的内膜开始,指向外膜。该过程约需40~50ms,同时通过室间隔使左室心内膜激动。随后再需50ms进入心室肌内的浦肯野氏纤维网,再使左室侧壁心肌的心内膜激动,结果左束支传导阻滞时,整个心室的激动时间约持续140~150ms,而左室间隔部或侧壁增厚时,将进一步增加心室除极
When the heart has a complete left bundle branch block, the earliest ventricular depolarization changes starting from the right ventricular endocardium. Or starting from the right ventricular surface of the septum, pointing to the left side of the septum, or starting from the inner membrane of the free wall of the right ventricle, pointing towards the outer membrane. The process takes about 40 ~ 50ms, at the same time through the left ventricular endocardial septal excited. Then 50ms into the ventricular myocardium Purkinje fiber network, and then to the left ventricular wall myocardial endocardial activation, the left bundle branch block, the entire ventricular activation time lasted about 140 ~ 150ms, and Left ventricular septum or sidewall thickening, will further increase ventricular depolarization