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.
Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.