Mechanism of bundle branch reentrant ventricular tachycardia

Schematic representation of the reentrant circuit in bundle branch reentrant ventricular tachycardia (BBRVT) showing a ventricular premature beat that blocks in the right bundle branch (RBB), conducts slowly up the left bundle branch (LBB), activates the bundle of His, and returns antegradely down the RBB. If the RBB has recovered its excitability from the preceding beat, the circuit is completed, and the reentrant circuit may become repetitive.