The rhythm is either sinus rhythm or not sinus rhythm. Sinus rhythm refers to the origination of the electrical activity coming from the sinus node — also known as the sinoatrial node, or SA node.

The Apple Watch Series 4's transformation from miniature iPhone and fitness tracker to medical device is now complete with the release of the ECG (electrocardiogram) app and irregular heart rhythm ...

The ECG app is one of the most vital features of the Apple Watch, allowing you to see an electrocardiogram of your heart whenever you want. Along with this, the Apple Watch can notify you of irregular ...

Electrocardiograms (ECG) are devices that doctors can use to record the heart’s electrical activity. Portable devices are also available for people who wish to monitor their heart health at home.