CNBC:

Apple has released a first-of-its-kind Heart Study app to research whether its Apple Watch can pick up a heart rhythmic disorder called atrial fibrillation — one of the most common causes of strokes and heart failure.

People who sign up for the study will use the watch to monitor their heart rate and heart rhythm and will consult with a physician if there’s an abnormality.

Atrial fibrillation is responsible for some 130,000 deaths every year in the U.S. alone.

Apple is continuing along a path that will take them to the Apple Watch becoming the preferred device for health monitoring.