Testing Apple Watch to track heart rhythm after heart surgery

This trial is testing whether an Apple Watch can reliably measure how often irregular heartbeats occur after you've had surgical treatment for atrial fibrillation (a common heart rhythm problem) combined with mitral valve surgery. You would wear both an Apple Watch and a clinical-grade heart monitoring patch at the same time so researchers can compare how well the Apple Watch detects irregular heartbeats compared to the more traditional patch monitor.

After heart surgery to fix atrial fibrillation, doctors need to know if the irregular heartbeats come back—but current monitoring methods require special clinic visits or uncomfortable patches. This study wants to see if a smartwatch you can wear every day at home is just as good at catching those irregular heartbeats.