心脏的束支传导系统由发自希氏束主干的左、右束支和左束支的分支——左前半支和左后半支构成。右束支、左前半支和左后半支又称三分支系统,其中的两条分支同时或交替发生传导阻滞即称双束支阻滞(Bilateral Bundle Branch Block,缩写为BBBB)。BBBB的心电图改变及其原理国内书刊已有介绍,本文着重讨论其与临床有关的问题。 BBBB的类型和发生率 (一)BBBB的常见类型由于发生传导阻滞的两条分支相互组合不同,BBBB的心电图表现比较复杂,不同作者 The bundle branch of the heart is made up of the branches of the left and right bundle branches and the left bundle branches originating from the main beam of the bundle - left front half and left back half. The right bundle branch, the left anterior branch and the left posterior branch, also known as the tripartite branch system, in which the two branches occur simultaneously or alternately block is called Bilateral Bundle Branch Block (abbreviated BBBB). BBBB ECG changes and the principle of domestic journals have been introduced, this article focuses on its clinical issues. Type and incidence of BBBB (a) common types of BBBB due to the conduction of the two branches of the block combination of each other, BBBB ECG performance is more complicated, different authors