Rate-Dependent Exit Conduction Block From Pulmonary Vein to Left Atrium After Entrance Block

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 exit conduction block. A 63-year-old m...

Bradycardia-dependent conduction block into pulmonary vein after isolation.

Double irregular ventricular parasystole: rate-dependent entrance block and "supernormal" exit conduction.

An analysis of electrocardiograms from a patient with spontaneous double irregular ventricular parasystole is presented. Irregularity in one of the two parasystoles was produced by intermittence based on rate-dependent (phase 3) entrance block, and in the other parasystole it was attributed to "supernormal" exist conduction. Critical analysis of electrocardiograms revealed that first degree blo...

Lessons from dissociated pulmonary vein potentials: entry block implies exit block

AIMS Prior reports using pacing manoeuvres, demonstrated an up to 42% prevalence of residual pulmonary vein to left atrium (PV-LA) exit conduction after apparent LA-PV entry block. We aimed to determine in a two-centre study the prevalence of residual PV-LA exit conduction in the presence of unambiguously proven entry block and without pacing manoeuvres. METHODS AND RESULTS Of 378 patients, 1...

Non-inducibility post-pulmonary vein isolation achieving exit block predicts freedom from atrial fibrillation.

AIMS This study evaluates whether non-inducibility of atrial fibrillation (AF) after achieving bi-directional electrical pulmonary vein (PV) isolation is a useful predictor of freedom from AF recurrence. METHODS AND RESULTS This study included 102 consecutive patients who underwent PV isolation for symptomatic paroxysmal (59%), persistent (32%), or permanent (9%) AF. Patients were followed fo...