Any tachycardic rhythm with a left or right bundle branch block that is NOT ventricular tachycardia is considered "supraventricular tachycardia with aberrancy". This would even include sinus ...

Verapamil sensitive ventricular ... ventricular tachycardia that occurs with a structurally normal heart arising from the left posterior fascicle. This manifests as a right bundle branch block ...

These symptoms were found to be associated with episodes of nonsustained ventricular tachycardia ... with an inferior axis right bundle branch block morphology which would terminate and reinduce ...

Following MI, arrhythmias such as ventricular tachycardia, ventricular fibrillation, atrioventricular block, and bundle branch block significantly increase mortality. Read the full story here.