A Study to Determine if Identification of Undiagnosed Atrial Fibrillation in People at Least 70 Years of Age Reduces the Risk of Stroke

Inclusion Criteria: * Men and women at least 70 years of age who are new or established participants in the primary care practice * Willing to provide consent to participate in the study and to use personal health information to ascertain endpoints from the Center for Medicare \& Medicaid Services (CMS) Medicare Claims Database and to access data from health records * Health insurance by Medicare Parts A \& B (Medicare Fee-for-service) Exclusion Criteria: * Oral anticoagulation (OAC) for any indication at the time of enrollment * History of Atrial Fibrillation (AF) or Atrial Flutter (AFL) as documented in the participant's current medical problem list * Any condition the investigator considers a contraindication to OAC, e.g., bleeding that required medical attention or severe renal impairment * Any condition the investigator considers will prevent compliance with study instructions * Implanted cardiac devices (pacemakers, implantable cardiac defibrillators, or cardiac resynchronization therapy, and implantable loop recorders) * History of allergy to adhesive * Not able to wear the Zio®XT monitor or not able to apply the monitor by herself/himself or with the help of a caregiver Other protocol-defined inclusion/exclusion criteria could apply