Clinical Investigation of the VytronUS Ablation System for Treatment of Paroxysmal Atrial Fibrillation

Inclusion Criteria: 1. Age between 18 and 75 years 2. History of symptomatic recurrent paroxysmal atrial fibrillation (PAF) in the prior year, defined by: a.Episodes of AF i.≥2 recurrent AF episodes of more than 30 seconds' duration that self-terminate and lasting no more than 7 continuous days or ii.Episodes of AF ≤ 48 hours duration terminated with electrical or pharmacologic cardioversion count as a paroxysmal atrial fibrillation episode b.At least one episode of paroxysmal atrial fibrillation (PAF) documented on 12-lead ECG, event monitor, or telemetry monitor in the prior year 3. Paroxysmal atrial fibrillation refractory to at least one Beta Blocker, Calcium Channel Blocker, or Class I or Class III anti-arrhythmic drug (AAD). 4. Subject is indicated for a pulmonary vein ablation according to society guidelines or investigational site practice. 5. Subject is able and willing to give informed consent. 6. Willingness, ability, and commitment to participate in baseline and follow-up evaluations for the full duration of the study. Exclusion Criteria: 1. Non-paroxysmal AF (e.g. persistent, long-standing persistent, or permanent AF) 2. AF secondary to electrolyte imbalance, thyroid disease or reversible or non-cardiac cause. 3. Prior LA ablation or surgery 4. Women known to be pregnant or breastfeeding or of childbearing potential unless on satisfactory contraceptive routine 5. NYHA Class III or IV congestive heart disease 6. LVEF \<40% measured by acceptable cardiac testing (eg. TTE, TEE) 7. Anteroposterior LA diameter \>5.5cm or \<3.0cm by TTE 8. Presence of intracardiac thrombus (including a known history of thrombus) within 30 days prior to the index ablation procedure 9. Presence of pulmonary vein stent(s) 10. Presence of pre-existing pulmonary narrowing or pulmonary vein stenosis 11. Presence of a cardiac valve prosthesis 12. Bleeding diathesis or contraindication to anticoagulation therapy 13. Blood clotting abnormalities (genetic) 14. MI, PCI, invasive cardiac procedure or surgery within 90 days prior to the index ablation procedure 15. Previous CVA, TIA, or PE within 3 months prior to the index procedure 16. Structural heart defect that, in the investigator's opinion, prevents catheter access or increases risk of ablation procedure 17. Pacemaker, ICD, or CRT implantation within 6 months prior to the index ablation procedure 18. Active systemic infection 19. Subject contraindicated for both MRI and CT 20. Life expectancy less than 360 days in physician's opinion 21. Participation in a drug or device study 22. Exclusion as per local laws -