Now, for those unacquainted with the nuances of cardiology, a standard in the doctor's office is the 12-lead ECG, which is like having a full orchestra compared to the Apple Watch's solo act.

The 12-lead electrocardiogram device, called the Kardia 12L ECG System, is a hand-held version of the standard ECG device usually found in hospitals and used to diagnose heart conditions.

By placing an Apple Watch on different parts of the body, researchers note that the 12-lead ECG could be used to predict whether a heart attack has occurred. The goal isn't to replace a standard ...