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60年代后由于对心室内传导系统的解剖,组织学的进一步了解,以及大量实验临床观察研究认为电轴显著左偏(-30°～-90°)是一种不正常的心电图。大多数病例是左前半支遭到损害的结果。其临床意义几乎和左束支传导阻滞相同,而且多数是冠心病,高血压等心脏疾患所致。但近来有些作者对其临床意义有不同看
60 years later due to the anatomy of the ventricular conduction system, further understanding of histology, and a large number of experimental clinical observation that the axis of significant left deviation (-30 ° ~ -90 °) is an abnormal ECG. Most cases are the result of damage to the left anterior branch. Its clinical significance and left bundle branch block almost the same, and most are caused by heart disease such as coronary heart disease and hypertension. Recently, however, some authors have looked differently at their clinical significance