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左前分支阻滞(简称LAH),系临床常见的心脏传导阻滞类型之一。我院自1975年1月至1981年8月共发现LAH66例,其中男54例,女12例,年龄在23至90岁,50岁以上有51例。平均额面电轴12例在-40°以下,54例在-40°至-90°间(其中43例在-40°至-70°)。QRS时限有57例在0.06～0.10秒之间,在0.11秒或以上者9例。本组计冠心病及可疑冠心病22例,高血压及高心病14例,风心病4例,心肌炎3例,肺心病4例,心肌梗塞1例,其他18例(其中10例为其他疾病老年患者,3例为体检)。关于诊断问题:LAH 的心电图诊断,目前尚无统一标准,根据本组心电图资料,提出诊断主要条件为:(1)电轴超过-30°(额面),在-40°以上诊断可靠性较大,应排除其他影响电轴左偏之因素。(2)I、avl 呈R 或qR 型,
Left anterior branch block (referred to as LAH), Department of clinical common heart block type. Our hospital from January 1975 to August 1981 were found in 66 cases of LAH, including 54 males and 12 females, aged 23 to 90 years old, 51 patients over the age of 51. The mean frontal axis was below -40 ° in 12 cases and in 54 cases between -40 ° and -90 ° (43 of them were at -40 ° to -70 °). 57 cases of QRS duration between 0.06 to 0.10 seconds, 0.11 seconds or more in 9 cases. This group of coronary heart disease and suspicious coronary heart disease in 22 cases, hypertension and heart disease in 14 cases, 4 cases of rheumatic heart disease, myocarditis in 3 cases, 4 cases of pulmonary heart disease, myocardial infarction in 1 case, other 18 cases (10 cases of other diseases in elderly Patients, 3 patients for physical examination). On the diagnostic issues: LAH ECG diagnosis, there is no uniform standard, according to the group of ECG data, the proposed diagnosis of the main conditions are: (1) electrical axis over -30 ° (frontal plane), more than -40 ° in the diagnosis of reliability Large, should exclude other factors that affect the left axis of the shaft. (2) I, avl was R or qR type,