Inclusion Criteria: All patients undergoing first redo AF ablation who have chronically isolated pulmonary veins and no non-PV triggers with provocation testing (randomized intra-procedure).  Exclusion Criteria:  Patients in whom ≥1 PVs have reconnected and AF triggers can be elicited from the reconnected PV. Patients who demonstrated non-PV triggers for AF. Patients who have experienced arrhythmia recurrence post ablation where the recurrent arrhythmia is other than atrial fibrillation or typical atrial flutter Failure to obtain informed consent Patients with a mechanical mitral valve