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传统的左前分支阻滞心电图诊断标准需有一定程度的电轴左偏,但左偏程度文献上意见不一,有主张较严的标准,额面QRS电轴须≤-45°,位于-45°～-90°之间;有主张较宽的标准,额面QRS电轴≤-30°即可,位于-30°～-90°之间;亦有主张额面QRS电轴即使>-30°时,亦可发生左前分支阻滞。众说纷纭,给实际工作带来困难。况且左前分支阻滞外,还有不少情况可产除生电轴左
Traditional left anterior branch block ECG diagnostic criteria need to have a certain degree of left-axis deviation, but left-degree degree of literature on the different views, there are stricter standards advocate frontal QRS axis ≤ -45 °, located at -45 ° ~ -90 °; there is advocate a wider standard, frontal QRS axis ≤ -30 ° can be located between -30 ° ~ -90 °; also advocated frontal QRS axis even> -30 °, left anterior branch block can also occur. Different opinions give difficulties to practical work. Moreover, the left anterior branch block, there are many cases can be generated except for the birth axis left