Abstract 14879: Resonance Phenomenon in the Success of Pulmonary Vein Isolation Procedure for Atrial Fibrillation

Background: Afib recurrence after single pulmonary vein isolation (PVI) procedure on paroxysmal AF ranges from 38% to 78%. In persistent AF PVI patients, success rate of the initial procedure does not reach 50%. Predictors of response are heavily studied, but currently are incomplete. Hypothesis: Pulmonary vein area at the ostium are characteristic of a resonance phenomena which relates to success or failure of the PVI procedure. Methods: Patients (100) with AF who underwent PVI, who had CMR before and 6±2 months after the procedure were retrospectively analyzed. The cross sectional area (CSA) of each pulmonary vein was measured from the 3D MRA of the left atrium and pulmonary veins. Patient response was evaluated using Holter monitoring for 2x15 days post PVI, and characterized as responders (R) if no or less than one minute of AF was experienced or non responders (NR) otherwise. Statistical analysis: Topological cluster analysis was used to order PVI patients: patients were ordered on an organizing vari...