Rate-Dependent Exit Conduction Block From Pulmonary Vein to Left Atrium After Entrance Block: New Implications of Pacing Rate to Confirm Bidirectional Conduction Block.

Pulmonary vein electric isolation (PVI) is an effective therapy for atrial fibrillation. Bidirectional conduction block between left atrium (LA) and the pulmonary veins (PV) is an accepted end point for PVI. We report a case of rate-dependent unidirectional exit conduction from PV to LA after PVI by large area circumferential ablation, despite entrance and… CONTINUE READING