An ECG on Your Wrist
Ever since the Apple Watch 4, the Apple Watch has come with an integrated ECG that helps you track any abnormal heart rhythm you might have.
An ECG, or Electrocardiogram, is a fast and easy test doctors use to evaluate the heart. If you place your finger on the Digital Crown on your Apple Watch, your Apple Watch will measure your heart’s electrical activity.
Even though not a lot of people like this Apple Watch feature that much, it’s still a useful tool that can help you measure abnormal heart rates and detect atrial fibrillation, which is an irregular and often fast heart rate.