Rate of Atrial Fibrillation Through 12 Months in Patients With Recent Ischemic Stroke of Presumed Known Origin

Inclusion Criteria: * Subject has had an ischemic stroke believed to be due to small vessel disease, large vessel cervical or intracranial atherosclerosis within the past 10 days * Subject is willing and able to undergo study requirements and expected to be geographically stable during study follow-up * Subject is 60 years of age or older, or age 50 to 59 years plus a documented medical history of at least one of the following additional risk factors for stroke: * Congestive heart failure * Hypertension (Systolic Blood Pressure \> 140) * Diabetes Mellitus * Prior Stroke (\>90 days ago, other than study qualifying index event) * Vascular disease (e.g. coronary artery disease, heart attack, peripheral artery disease and complex aortic plaque) Exclusion Criteria: * Subject has had a cryptogenic stroke * Subject has had a cardioembolic stroke * Subject has untreated hyperthyroidism * Subject has had a recent myocardial infarction \<1 month of stroke * Subject has had a recent cardiac surgery (e.g. coronary artery bypass surgery (CABG)) \<1 month of stroke * Subject has a mechanical heart valve * Subject has valvular disease requiring immediate surgical intervention * Subject has documented prior history of atrial fibrillation or atrial flutter * Subject has permanent indication for oral anticoagulation * Subject has permanent contraindication to oral anticoagulation such that detection of AF would not change medical management, based on enrolling investigators judgment * Subject is enrolled in a concurrent study that may confound the results of this study. Co-enrollment in any concurrent clinical study (including registries) requires approval of the study manager or designee. * Subject's life expectancy is less than 1 year * Subject is pregnant * Subject has or is indicated for implant with a pacemaker, Implantable Cardioverter Defibrillator (ICD), Cardiac ResynchronizationTherapy (CRT), or an implantable hemodynamic monitor * Subject with a medical condition that precludes the patient from participation in the opinion of the investigator