摘要1概念 不确定心电轴（indeterminate axis）指QRS波群的额面平均心电轴位于一90°～-180°之间，又称为无人区电轴（no mall’s land），西北象限心电轴（Noahwest quadrant axis），极度左偏或右偏心电轴（extreme left or right axis deviation）等。
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