Page 141 - ECG dr shamol_Slide

Now as depolarization wave / Vector II travels from left to right through the right

ventricular mass and depolarize the right ventricle.

It cause a upward notch in the Q wave of V1 (as depolarization toward the lead ) &

Causes a downward notch in the R wave of V5 (as depolarization oposite the lead )