<unk>  is a cardiac conduction abnormality seen on the electrocardiogram (ECG) whereby there is an impairment of transmission of the cardiac electrical impulse along the fibers of the<unk>  main<unk><unk> , or both the<unk>  anterior fascicle and<unk>  posterior fascicle.  This conduction disturbance is characterized by wide (greater than or equal to 0.12 seconds) QRS complexes.  In this condition, activation of the<unk>  ventricle is delayed, which results in the<unk>  ventricle contracting later than the right ventricle.
Left bundle branch block
Right bundle branch block
Fascicular VT
Third degree AV block
Second degree AV block
Atrioventricular dissociation
First degree AV block
Bundle branch block