Left Atrial Appendage Exclusion Study

Inclusion Criteria: 1. Subject is greater than or equal to 18 years of age 2. Subject has atrial fibrillation (paroxysmal or persistent) 3. Subject is poor candidate for Warfarin (contraindicated, labile INR, non-compliant) 4. Subject is willing and able to provide written informed consent 5. Subject has a life expectancy of at least 1 year 6. Subject is willing and able to return for scheduled follow up visits Exclusion Criteria: 1. Previous cardiac surgery 2. Thrombus in the left atrial appendage or left atrium 3. NYHA Class IV heart failure symptoms 4. Need for emergent cardiac surgery (i.e. cardiogenic shock) 5. LAA is not appropriate for exclusion based upon intraoperative evaluations 6. Current diagnosis of active systemic infection 7. Renal failure requiring dialysis or hepatic failure 8. A known drug and/or alcohol addiction 9. Mental impairment or other conditions, which may not allow subject to understand the nature, significance and scope of the study 10. Pregnancy or desire to get pregnant within 12 months of the study treatment 11. Preoperative need for an intra-aortic balloon pump or intravenous inotropes 12. Patients who have been treated with thoracic radiation 13. Patients in current chemotherapy 14. Patients on long-term treatment with steroids not including intermittent use of inhaled steroids for respiratory diseases. 15. Patients with known connective tissue disorders, i.e. Lupus 16. Previous history of pericarditis 17. Presence of a PFO/ASD or valve implant