Apple Watch never checks for heart attacks

Basically, this is really just a disclaimer that Apple Watch cannot detect heart attacks.

According to Apple:

Things you should know

• Apple Watch cannot detect heart attacks. If you ever experience chest pain, pressure, tightness, or what you think is a heart attack, call emergency services immediately.

• Apple Watch is not constantly looking for AFib. This means Apple Watch cannot detect all instances of AFib, and people with AFib may not get a notification.

• If you’re not feeling well, you should talk to your doctor even if you don’t get a notification. Symptoms such as a rapid, pounding, or fluttering heartbeat, dizziness, or fainting, can indicate a serious condition.

• Do not change your medication without talking to your doctor.

• In some instances, the notification may indicate the presence of an irregular heart rhythm other than AFib.

^{Source: Heart rate notifications on your Apple Watch, Apple.}