Added Value of Vein of Marshal Ethanol Infusion Compared to Superior Vena Cava Isolation Alone in Patients Undergoing Repeat Ablation for Recurrent Paroxysmal Atrial Fibrillation Despite Durable PV Isolation

Inclusion Criteria: * Patients older than 18 years * Patients scheduled for a repeat ablation of PAF after a previous PVI * Confirmation of lasting pulmonary vein isolation at the time of randomization Exclusion Criteria: * Patients with persistent atrial fibrillation * Previous ablation with isolation of the SVC, roofline, mitral line or previous vein of Marshal ethanol infusion * Left atrial thrombus. Left atrial appendage thrombus can be determined by preprocedural imaging: CT, transesophageal echocardiography or MRI. * Left ventricular ejection fraction \<35%. * Cardiac surgery within the previous 90 days. * Expecting cardiac transplantation or other cardiac surgery within 180 days. * Coronary percutaneous transluminal coronary angioplasty/stenting within the previous 90 days or myocardial infarction within the previous 60 days. * Documented history of a thromboembolic event within the previous 90 days. * Diagnosed atrial myxoma. * Significant restrictive, constrictive, or chronic obstructive pulmonary disease with chronic symptoms. * Significant congenital anomaly or medical problem that in the opinion of the investigator would preclude enrollment * Women who are pregnant or who plan to become pregnant during the study. * Acute illness or active infection at time of index procedure * Advanced renal insufficiency * Unstable angina. * History of blood clotting or bleeding abnormalities. * Contraindication to anticoagulation. * Life expectancy less than 1 year. * Presence of a condition that precludes vascular access. * International Normalized Ratio greater than 3.5 within 24 hours of procedure - for patients taking warfarin. * Patient cannot be removed from antiarrhythmic drugs for reasons other than AF. * Unwilling or unable to provide informed consent.