Rhythm Evaluation for AntiCoagulaTion With COntinuous Monitoring

Inclusion Criteria:

Patients must meet all of the following criteria:

1. Age 18 and above.

2. Patients with non-valvular, non-continuous AF and either:

(A) Infrequent AF episodes without a rhythm control strategy who have had no
documented AF lasting > 1 hour for 3 consecutive months (the last 2 of which are on a
previously implanted Reveal XT implantable cardiac monitor), or (B) Previous or
current rhythm control strategy. Rhythm control strategies may include: i. Class I or
Class III antiarrhythmic drugs ii. Pulmonary vein isolation iii. Post-MAZE/minimally
invasive MAZE

3. Current Reveal XT implant prior to study enrollment.

4. Documented clinical history of symptomatic or asymptomatic paroxysmal, long-standing
persistent or persistent AF prior to rhythm control initiation. The duration of AF
must have been > 30 seconds as documented by an external monitor, present 12 lead
ECG, or Reveal XT.

5. CHADS2 score of 1 or 2

6. Candidates for chronic anticoagulation with an FDA-approved non-Coumadin oral
anticoagulant (dabigatran, rivaroxaban, apixaban), based on the discretion of the
treating physician.

7. Demonstrated ability to tolerate dabigatran 150mg/BID (if CrCl >30ml/min),
rivaroxaban 15mg QD (if CrCl 15-49 ml/min) and 20mg QD (if CrCl ≥50ml/min), or
apixaban 5mg BID or 2.5 mg for subjects with ≥2 of the following: age ≥ 80 years,
body weight ≤60kg, serum creatinine ≥1.5 mg/dl.

8. Able and willing to provide written informed consent and willing to follow
instructions, attend all required study visits, and undergo all planned tests.

9. Subject must be willing and able to discontinue oral anticoagulation for the purposes
of this study

Exclusion Criteria:

Patients should not have any of the following criteria:

1. Permanent AF

2. Any documented single AF episode lasting ≥ 1 hour per month over two consecutive
months prior to study enrollment.

Mechanical prosthetic valves or severe valve disease.

3. CHADS2 score of 0, or > 2

4. Subject deemed high risk for non-cardioembolic stroke (i.e. significant carotid
artery disease) based on discretion of the investigator.

5. Individual is pregnant, nursing, or planning to become pregnant.

6. Known hypersensitivity to non-Coumadin oral anticoagulants.

7. Documented prior stroke or transient ischemic attack.

8. Reversible causes of AF (e.g., cardiac surgery, pulmonary embolism, untreated
hyperthyroidism).

9. Conditions associated with an increased risk of bleeding:

- Major surgery in the previous month

- Planned surgery or intervention in the next 3 months.

- History of intracranial, intraocular, spinal, retroperitoneal or atraumatic
intra-articular bleeding

- Gastrointestinal hemorrhage within the past year unless the cause has been
permanently eliminated (e.g. by surgery)

- Symptomatic or endoscopically documented gastroduodenal ulcer disease in the
previous 30 days

- Hemorrhagic disorder or bleeding diathesis

- Need for anticoagulant treatment for disorders other than AF

- Required use of non-aspirin antiplatelet agents (i.e., Plavix) at time of
enrollment

- Uncontrolled hypertension (SBP >180 mmHg and/or DBP >100 mmHg)

10. Recent malignancy or radiation therapy (≤6 months)

11. Anemia (hemoglobin <10g/dL) or thrombocytopenia (platelet count <100K/UL)

12. Patients who have received an investigational drug in the past 30 days or are
participating in a drug study.

13. Intolerance or hypersensitivity to low dose aspirin therapy

14. Life expectancy less than the expected duration of the trial due to concomitant
disease.

15. Any concomitant condition which, in the opinion of the investigator, would not allow
safe participation in the study (e.g., drug addiction, alcohol abuse).

16. Inability to comply with daily data transmission requirements.

17. Known history of isolated atrial flutter/atrial tachycardia without atrial
fibrillation.

18. More than 10 false positive atrial fibrillation events lasting > 30 minutes per month
for two months prior to enrollment on a previously implantable cardiac monitor.

19. Severe renal impairment (CrCl < 15 ml/min)