A recent study has demonstrated that Apple Watch's heart health features can significantly improve early diagnosis of atrial fibrillation (AF), potentially reducing stroke risk. The research, published in the Journal of the American College of Cardiology, indicates that using an Apple Watch increases the likelihood of diagnosing AF by four times compared to standard care.
The study involved 219 patients over the age of 65 with elevated stroke risk. Those using the Apple Watch had 21 diagnoses of AF, with 57% of these patients showing no outward symptoms other than those detected by the watch. In contrast, only five patients in the control group were diagnosed, all of whom were symptomatic. This suggests that the Apple Watch can identify AF in individuals who might otherwise remain undiagnosed.
Dr. Michael Winter, a cardiologist at Amsterdam UMC, advocates for the integration of smartwatches into medical practice. He stated, "Using smartwatches with PPG and ECG functions aids doctors in diagnosing individuals unaware of their arrhythmia, thereby expediting the diagnostic process." He further emphasized that this approach could reduce stroke risk and healthcare costs.
The American College of Cardiology (ACC) has also recognized the potential of wearable devices like the Apple Watch in cardiovascular care. In May 2025, the ACC issued guidance to help clinicians and patients effectively use health data collected from the Apple Watch to manage cardiovascular health. The guidance includes best practices for incorporating Apple Watch data into patient care plans and emphasizes the importance of accurate data collection and sharing. (acc.org)
For individuals interested in utilizing the Apple Watch's heart health features, it's essential to set up the device correctly. Apple provides guidance on enabling heart rate notifications, which can alert users to irregular heart rhythms suggestive of AF. To activate these notifications, open the Health app on your iPhone, search for "Heart," then tap "Irregular Rhythm Notifications," and follow the on-screen instructions. Ensure that notifications are enabled in the Apple Watch app under My Watch > Heart > Irregular Rhythm.
In summary, the integration of wearable technology like the Apple Watch into healthcare practices offers a promising avenue for the early detection and management of atrial fibrillation, potentially leading to better patient outcomes and reduced healthcare costs.