Apple and Stanford created the Apple Watch's Irregular Heartbeat Alerting Assessment Study, which occasionally checks the heartbeat of the wearer in the background and sends a notification when an irregular heartbeat suggests atrial fibrillation.
419,093 people from the United States participated in the study. When irregular heart rhythms were detected, study participants received notification of their Apple Watch and their iPhone, a telephone consultation with a physician, and an ECG patch for additional monitoring.
The study results showed that 0.5 percent of the participants ̵
Apple COO Jeff Williams:
We are proud to partner with Stanford Medicine in conducting this important research, and look forward to hearing more about the impact of the Apple Watch in addition to the medical community experience. We hope consumers will continue to receive useful and actionable information about their heart health through the Apple Watch .
Apple announced the Heart Study in November 2017 in collaboration with Stanford and did not accept new participants in August 2018.