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  1. Apple Watch Series 4 and later has an electrical heart rate sensor that, along with the ECG app, allows you to take an electrocardiogram (or ECG). To use the ECG app, update your iPhone Xs or later to the latest version of iOS and Apple Watch to the latest version of watchOS.
    support.apple.com/guide/watch/ecg-apdea4c50a57…
    The ECG app can record your heartbeat and rhythm using the electrical heart sensor on Apple Watch Series 4 or later and all models of Apple Watch Ultra * and then check the recording for atrial fibrillation (AFib), a form of irregular rhythm. The ECG app records an electrocardiogram which represents the electrical pulses that make your heart beat.
    support.apple.com/en-us/120278
    The ECG app made its debut on the Apple Watch Series 4 and has continued to appear on all following watches in the numbered series. It is also available on the Apple Watch Ultra. The app allows users to take an electrocardiogram with the help of electrodes built into the back of the watch and check for signs of atrial fibrillation (AFib).
    screenrant.com/apple-watch-se-2-ecg-sensor-explai…
     
  2. Which Apple Watch Has ECG Functionality?

    Oct 2, 2024 · How Does the Apple Watch ECG Work? The Apple Watch uses a combination of electrical and optical heart sensors to detect your heart’s rhythm. It measures the electrical signals across your wrist, generating an ECG …

     
  3. Apple Watch ECG app: What cardiologists want you to know

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