Coherent Sine Burst Electroporation (CSE) Ablation System US IDE Study for Patients With Atrial Fibrillation

Inclusion Criteria:

1. Patients between the ages of 18 and 80 years, or older than 18 if required by locallaw.

2. Diagnosis of drug refractory, recurrent, paroxysmal or persistent AF: a. Symptomatic paroxysmal AF that is less than 7 days in continuous duration,documented by the following: i. Physician documentation of symptomatic recurrent PAF (2 or more episodes) within 6 months prior to enrollment AND ii. At least 1documented AF episode from any form of rhythm monitoring within 12 months prior toenrollment. b. Symptomatic persistent AF that is sustained beyond 7 days and less than 1 year (≥ 7 and ≤ 365 days), documented by the following: i. Physician documentation of atleast 1 symptomatic persistent AF episode within 6 months prior to enrollment. ii. Either a 24-hour continuous ECG recording documenting continuous AF OR 2 ECGsfrom any regulatory cleared rhythm monitoring device showing continuous AF taken atleast 7 days apart, within 6 months prior to enrollment.

3. Effectiveness failure of, intolerance to, or a specific contraindication to at leastone Class I or III anti-arrhythmic drug.

4. Willing and able to give informed consent.

5. Willingness, ability, and commitment to participate in baseline, follow-up, andrhythm monitoring evaluations for the full length of the study.

6. Life expectancy >1 year.

Exclusion Criteria:

1. In the opinion of the Investigator, any known contraindication to an AF ablation (including present left atrial [LA] thrombus), trans-esophageal echocardiogram (TEE)or computed tomography (CT) scan, or anticoagulation.

2. Any duration of continuous AF lasting longer than 12 months.

3. History of any previous left atrial ablation or surgical procedure, including priorleft atrial appendage closure.

4. AF secondary to electrolyte imbalance, thyroid disease, alcohol, or any otherreversible or non-cardiac cause.

5. Left ventricular ejection fraction (LVEF) < 35% within 6 months of enrollment (e.g.transthoracic echocardiogram (TTE), multiple-gated acquisition (MUGA), magneticresonance imaging (MRI), nuclear stress test).

6. New York Heart Association (NYHA) Class III or IV.

7. Left atrial diameter > 5.0 cm (anteroposterior) within 6 months of enrollment (MRI,CT, TTE, TEE, or physician's note) or non-indexed volume >100mL if left atrialdiameter is not available.

8. Current or anticipated implant of a permanent pacemaker, implantable cardioverter orresynchronization device, interatrial baffle, foramen ovale occluder, LA appendageclosure, or active implantable/insertable cardiac loop recorder/monitor at the timeof the ablation procedure.

9. Body mass index (BMI) >40.

10. Patients who have not been on anticoagulation therapy for at least 3 weeks prior tothe Index Procedure.

11. Previous cardiac surgery, myocardial infarction, percutaneous coronary interventionor angioplasty (PCI/PTCA) or coronary artery stenting within 3 months prior toenrollment.

12. Symptomatic valvular disease, history of cardiac valve surgery, or prosthetic mitraland tricuspid valve(s).

13. Presence of pulmonary vein abnormalities of stenosis or stenting.

14. Primary pulmonary hypertension.

15. Uncontrolled or untreated hypertension (two measurements of >180mmHg systolic or >110 mmHg diastolic at baseline).

16. Pre-existing hemi-diaphragmatic paralysis.

17. Renal insufficiency with an estimated glomerular filtration rate (eGFR) < 40mL/min/1.73 m2, or any history of renal dialysis or renal transplant.

18. Rheumatic heart disease.

19. Unstable angina or ongoing myocardial ischemia.

20. Hypertrophic cardiomyopathy, advanced restrictive cardiomyopathy, or severe leftventricular hypertrophy (left ventricular thickness >15mm).

21. History of blood clotting or bleeding disease (e.g., thrombocytosis).

22. History of documented cerebral infarction, transient ischemic attack, or systemicembolism within 6 months prior to enrollment.

23. Active systemic infection.

24. Active malignancy or history of treated malignancy within 12 months of enrollment (other than cutaneous basal cell or squamous cell carcinoma, or non-metastaticprostate or breast cancer with life expectancy remaining >1 year).

25. Pregnant or lactating (current or anticipated during study follow-up).

26. Current enrollment in any other clinical study where testing or results from thatstudy may interfere with the procedure or outcomes measurement for this study.

27. Any other condition that, in the judgment of the Investigator, makes the patient:

28. Unlikely to benefit from an AF ablation procedure (e.g., advanced infiltrativecardiomyopathies, severe mitral stenosis or regurgitation, and/or corpulmonale, etc.), or

29. A poor candidate for the study (e.g., vulnerable patient population, mentalillness, addictive disease, terminal illness, and extensive travel away fromthe research center).