Sad to say that will not be the case without quality pre-hospital care.
No heart attack here in nearby Columbus, but, when I hit a tree after sliding my 1 ton truck off a bridge, I told the Officer my chest hurt a bit (hell, I'd just got impaled by the steering wheel.) He called the EMT guys.
Despite my protestations that I was only bruised and not in arrest, I had a complete and exhaustive, roadside cardiac exam.