Hi Tim, thank you for taking the time to ask us your question about the Samsung Galaxy Watch7. Yes, the advertised Galaxy Watch7 can detect rapid heart rates and irregular rhythms suggestive of Atrial Fibrillation using its BioActive Sensor and ECG app, with FDA-cleared Irregular Heart Rhythm Notification (IHRN) features that alert you to potential AFib and allow on-demand ECG recordings, however, it's for general wellness and not a replacement for professional diagnosis. If you have any other questions or if you would like further assistance, please do not hesitate to contact Support at your earliest convenience. Thank you for being a valued Samsung customer. - Debra