The average direction of spread of the depolariation wave through the ventricle as seen from the frontal plane
determine by the lead I,II,II->look at the QRS wave
right axis deviation
I-negative
II,III-positive
left axis deviationI-positive
II,III-negative
u can also determine the cardiac axis by looking at the lead I and aVF.if patient is having left axis deviation,then check lead II.
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