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左束支前分支传导阻滞(以下简称LAH)可部分地掩盖右束支传导阻滞(以下简称RBBB),使RBBB在Ⅰ导联及左胸前导联中的S波消失。本文报道3例LAH完全掩盖RBBB诊断的患者,其中1例RBBB为不完全性,2例为完全或高度阻滞者;2例LAH系间歇性,为研究及确定上述诊断提供了条件,另1例LAH为持续性,由于同时描记了高一肋间的胸导联而使被掩盖的RBBB获得确诊。一般而言,LAH程度越严重,Ⅱ、Ⅲ导联中S波越深,Ⅰ、aVL导联中S波就越小。本文3例中LAH不仅消除了Ⅰ、aVL导联中S波,并使V_1导联中终末R波也消失,因而完全掩盖了RBBB的诊断。其中2例同时进行心向量检查,也无法肯定RBBB的存在,只因在横面图中可见有迟缓的指向右的
Left bundle branch branch block (hereinafter referred to as LAH) can partially cover the right bundle branch block (hereinafter referred to as RBBB), so that RBBB in lead Ⅰ and left chest lead S wave disappears. This article reports 3 cases of LAH completely cover the diagnosis of RBBB patients, 1 case of RBBB is incomplete, 2 cases were complete or highly block; 2 cases of LAH intermittent, to study and determine the conditions for the diagnosis, the other 1 In the case of persistent LAH, the obscured RBBB was diagnosed due to the simultaneous interpretation of a high intercostal chest lead. In general, the more severe the degree of LAH, the deeper the S wave in the leads II and III, the smaller the S wave in the leads I and aVL. In this paper, 3 cases of LAH not only to eliminate the Ⅰ, aVL lead in the S wave, and the V_1 lead in the terminal R wave disappeared, thus completely cover the RBBB diagnosis. Two of them also performed cardiac vector examination, and they were unable to confirm the existence of RBBB because only a slow, right-pointing