Withings ScanWatch has received CE certification for medical devices and is now available in Europe.
ECG
How to get the accuracy of a 12-lead ECG with an Apple Watch
Multichannel Electrocardiograms Obtained by a Smartwatch for the Diagnosis of ST-Segment Changes – JAMA Cardiology
Some researchers at Magna Grecia University have experimented with a technique to use Apple’s smartwatch instead of a traditional ECG.
Apple Watch detects coronary ischaemia
An article in the European Heart Journal describes a case where an Apple Watch was used to diagnose coronary ischaemia during an episode of chest pain.
Digital-health 