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Axis deviation

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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The normal cardiac axis is seen in leads I, II and III of the ECG.

In the normal cardiac axis there is predominantly an upward deflection in all of these leads. The deflection will be greater in II than I or III.

In right axis deviation I becomes predominantly negative and III becomes predominantly positive.

In left axis deviation III becomes negative. II also becomes more negative.

Click for more detailed information and ECG examples

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