I'm just throwing this out there for what it's worth. Totally only my opinion- which isn't worth much.
I have read many different experiences with Apple watches and those types of things. What I hear is that the constant monitoring and input of information causes more stress and questioning. If Cardiac issues are that serious, having a good Cardiologist is a must. If continuous monitoring is needed, there are medical devices for that.
When my young adult son became ill with serious heart issues. We thought about an Apple Watch or something like that- but looking back. I think that it would have caused more stress to be constantly checking it and wondering about it.