Atrial Fibrillation (AF) is when the heart doesn't beat regularly. It's tricky because people often don't feel any symptoms, so it goes undiagnosed. To help prevent strokes in people with AF, they usually take special medicine called anticoagulants. However, finding AF early needs long-term monitoring, which can be expensive and hard to do.

This study uses smart devices like Apple watches or Fitbits, which can track heart rhythms using special lights and motion sensors. The study will check if these devices, with the help of smart computer programs, can reliably detect AF. Participants will wear these devices for 30 days, almost all day long, and the data collected will be analyzed to see how well these devices work.

The study will involve 500 people who had a stroke for unknown reasons, and are treated at the Emory Stroke Center. They'll wear a wrist device and undergo standard monitoring. The goal is to see if smart devices can be a cheaper option for heart monitoring.

• Duration: 30 days with a wrist device.
• Participation: For people 55+, no AF diagnosis yet, and had a stroke.
• Location: Emory Stroke Center, follow-up needed.