My grandfather died at a hospital in South Africa in 1997 after experiencing chest pain. Apparently, he went to reception, and they told him and my uncle to take a lift/elevator up to the ward, and he died in the lift. I was told afterward that it's a no-no to exert oneself during a heart attack. No idea if that's true or not.
Anyway, not second guessing OP, just putting it out there.