How to use ECG on Apple Watch

Audible
To take an ECG recording at any time or following an irregular rhythm notification, users open the new ECG app on Apple Watch Series 4 or later and hold their finger on the Digital Crown.

As the user touches the Digital Crown, the circuit is completed and electrical signals across their heart are measured. 

After 30 seconds, the heart rhythm is classified as either AFib, sinus rhythm or inconclusive.

All recordings, their associated classifications and any noted symptoms are stored securely in the Health app on iPhone.

Users can then share a PDF of the results with their physicians.

With watchOS 6, the irregular rhythm notification feature will use the optical heart sensor to occasionally check the user’s heart rhythm in the background for signals of an irregular heart rhythm that appears to be Afib. If irregular heart rhythm such as Afib is identified on five rhythm checks over a minimum of 65 minutes, a notification will be generated to alert the user.

The ECG app’s ability to accurately classify an ECG recording into AFib and sinus rhythm was validated in a clinical trial of around 600 participants.

 The study found the ECG app on Apple Watch demonstrated 98.3 per cent sensitivity in classifying AFib and 99.6 per cent specificity in classifying sinus rhythm in classifiable recordings. The irregular rhythm notification feature was recently studied in the Apple Heart Study. With over 400,000 participants, the Apple Heart Study was the largest screening study on atrial fibrillation ever conducted.

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