NAVISTAR® THERMOCOOL® SF Catheter: Observational Study

Inclusion Criteria: * Drug refractory, recurrent, symptomatic paroxysmal atrial fibrillation * Age 18 years or older * Patients must be able and willing to provide written informed consent to participate in the study Exclusion Criteria: * Atrial fibrillation secondary to electrolyte imbalance, thyroid disease, or reversible or non-cardiac cause * Previous ablation for atrial fibrillation * Episodes of atrial fibrillation that last longer than 30 days and are terminated via cardioversion * Uncontrolled heart failure, or NYHA Class III or IV heart failure * Documented intra-atrial thrombus or other abnormality on pre-ablation echocardiogram * Contraindication to anticoagulation * Stroke, cardiac surgery, unstable angina, myocardial infarction or percutaneous coronary intervention within the past 3 months * Awaiting cardiac transplantation * Heart disease in which corrective surgery is anticipated within 6 months * Enrollment in investigational drug, biologic or device study * Subjects unwilling to comply with protocol or follow-up requirements * Patients who are pregnant