DiamondTemp™ System for the Treatment of Persistent Atrial Fibrillation

The DIAMOND-AF II Study is a prospective, non-randomized (single-group assignment) trial
being performed at multiple centers in the United States, Canada and Europe to evaluate the
safety and effectiveness of the DiamondTemp Ablation System for the treatment of patients
with persistent atrial fibrillation.

Inclusion Criteria:

1. Above eighteen (18) years of age or of legal age to give informed consent specific to
state and national law.

2. Subjects with a history of documented symptomatic, persistent atrial fibrillation with
1) a physician's note documenting a continuous AF episode lasting longer than 7 days
but less than 12 months and 2) a 24-hour Holter within 90 days of the ablation
procedure showing continuous AF.

3. Refractory, intolerant or contraindicated to at least one Class I or III
anti-arrhythmic (AAD) drug.

4. Suitable candidate for intra-cardiac mapping and ablation of arrhythmia.

5. Subject agrees to comply with study procedures and be available (geographically
stable) for follow-up visits for at least 12 months after enrollment.

6. Subject is willing and able to provide written consent.

Exclusion Criteria:

At time of enrollment and/or prior to procedure:

1. Continuous AF >12 months (long-standing persistent AF)

2. Paroxysmal AF with longest episode <7 days

3. AF secondary to electrolyte imbalance, thyroid disease or reversible or non-cardiac
cause

4. Rheumatic heart disease

5. Severe mitral regurgitation

6. Hypertrophic cardiomyopathy

7. LA diameter >5.5 cm

8. Left ventricular ejection fraction (LVEF) <40%

9. Currently NYHA Class III or IV or exhibits uncontrolled heart failure

10. Body Mass Index (BMI) >42 kg/m2.

11. LA ablation, septal closure device or mitral valve surgical procedure at any time
prior to enrollment

12. Presence of intramural thrombus, tumor or abnormality that precludes vascular access,
catheter introduction or manipulation

13. Coagulopathy, bleeding diathesis or suspected procoagulant state

14. Sepsis, active systemic infection or fever (>100.5 oF / 38 oC) within a week prior to
the ablation procedure

15. Significant restrictive or obstructive pulmonary disease or chronic respiratory
condition

16. Renal failure requiring dialysis or renal compromise that in the investigator's
judgement would increase risk to the subject or deem the subject inappropriate to
participate in the study.

17. Known allergies or intolerance to anticoagulant and antiplatelet therapies to be used
in conjunction with the study or contrast sensitivity that cannot be adequately
pre-treated prior to the ablation procedure.

18. Positive pregnancy test results for female subjects of childbearing potential or
breast feeding.

19. Enrollment in a concurrent clinical study that in the judgement of the investigator
would impact study outcomes.

20. Acute or chronic medical condition that in the judgment of the investigator would
increase risk to the subject or deem the subject inappropriate to participate in the
study.

21. Life expectancy <12 months based on medical history or the medical judgement of the
investigator.

Within 1 month of enrollment or just prior to procedure:

22. Documented LA thrombus upon imaging

23. Creatinine >2.5mg/dl or creatinine clearance <30mL/min

Within 3 months of enrollment:

24. Significant gastrointestinal (GI) bleed

25. Myocardial infarction (MI), unstable angina, cardiac surgery or coronary intervention

Within 6 months of enrollment:

26. Coronary artery bypass graft (CABG) procedure

27. Implant procedure performed for ICD, CRT leads or pacemaker

28. Documented stroke, CVA, TIA or suspected neurological event