ECG - Axis Deviation

Question 1

Explain how the deflection of leads I and aVF change with axis deviation.

Answer 1

Normal axis: I - positive; aVF - positive

Left axis: I- positive ; aVF - negative

Right axis: I- negative ; aVF - positive

Extreme right axis: I- negative; aVF - negative (moving away from I and aVF)

Question 2

Draw the axis diagram for the heart.

Answer 2

I: 0 degrees 
II: 60 degrees 
III: 120 degrees
aVL:
aVR:
aVF: