<unk>  <unk>  results from a defect in the heart's electrical conduction system. There is a delay in failure of transmission of electrical impulses down the<unk>  bundle of the heart.  As a result, the<unk>  ventricle depolarizes by an alternate mechanism. This is by means of cell-to-cell conduction. These cell to cell conduction impulses spread more slowly than usual from the interventricular septum to the left ventricle and to the<unk>  ventricle. This delay in conduction results in the characteristic ECG pattern which is a wide and notched QRS. Although conduction down the<unk>  bundle is delayed, conduction down the left bundle  is normal. As a result, the interventricular septum and left ventricle depolarize in the normal fashion.
Right bundle branch block
Left bundle branch block
Bundle branch block
Fascicular VT
Third degree AV block
Second degree AV block
First degree AV block
Atrioventricular dissociation