Inclusion Criteria:  Age >=60 years First-detected atrial fibrillation (defined as atrial fibrillation diagnosed in the previous 60 days) Electrocardiographic documentation of atrial fibrillation. Estimated life expectancy of at least 1 year Capable of giving signed informed consent, which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol.  Exclusion Criteria:  Patients with prior or planned treatment with rhythm control, either catheter ablation or antiarrhythmic drug therapy. Prior hospitalization for AF Planned cardiothoracic surgery New York Heart Association class III or IV heart failure or a hospitalization for heart failure in the last 4 weeks Patients with reduced ejection fraction (LVEF ≤40%) Permanent atrial fibrillation Ineligible for oral anticoagulation, unless CHA2DS2-VASc is less than 3 in women or 2 in men. Bradycardia with a resting heart rate < 50 bpm PR interval >280 msec or 2nd degree or 3rd degree atrioventricular block without a permanent pacemaker/cardiac implanted electronic device. Corrected QT interval less than or equal to 500 msec. Pregnancy Severe hepatic impairment