The default ECG lead that you can record with an apple watch (ECG supported apple watch) is lead 1, this video explains how to record lead 2, lead 3 and other chest leads using your apple watch. It can be helpful if you are a doctor who owns an apple watch from series 4 on wards in diagnosing MI (myocardial infarction)/ heart attack.
Apple watch ECG
ECG apple watch
Apple watch ECG vs real ECG
0:00 Apple watch to detect MI or heart attack
0:52 Lead II - apple watch ECG
1:00 Lead III - apple watch ECG
1:13 Chest lead - apple watch ECG
#applewatch #ecg #lead