Several years ago, I had a full blown panic attack, and thought I was having a heart attack. I went to the ER and they did a 12-lead ECG on me. It seemed to take forever to get all the leads attached, and then the ECG just took about two minutes. It was a much longer time getting all the leads on!
Seems like there ought to be a way to do an ECG with a finger clamp like they use to get someone's oxygen level. That would make much more sense, but I suppose that's not possible, at least not yet.