[tgokh]

I'm assuming you mean people can be having an MI, or experiencing angina for quite some time, not actually in cardiac arrest

[JeremyMorgan]

Yes, I edited it for clarity, because by definition cardiac arrest is the sudden stop of blood flow, where MI/AMI/Angina are more gradual. All are commonly called "heart attacks" but are quite different. Thanks for keeping me honest here.