https://techcrunch.com/2023/05/08/samsungs-irregular-heart-rhythm-notification-galaxy-watch-fda-clearance/

Samsung announced today that its Irregular Heart Rhythm Notification feature for the Galaxy Watch has received FDA clearance. Together with the Galaxy Watch’s Electrocardiogram (ECG) function, the Irregular Heart Rhythm Notification feature monitors heart rhythms suggestive of atrial fibrillation.

Once the feature is activated in the Samsung Health Monitor app, it will check for irregular heart rhythms in the background via Galaxy Watch’s BioActive Sensor. If a certain number of consecutive measurements are irregular, the smartwatch will warn its user of potential AFib activity, prompting them to take an ECG using their watch for a more accurate measurement.