Joe,
This could be why electro-medical equipment has such a strict testing regime, it's not the sort of thing you EVER want to have fail at any time.
I know a guy that works at our local hospital as a test technician, we got to talking one night at the Supply house Xmas party, he tried to explain to me how an ECG machine worked in very great detail, my eyes glazed over, he was telling me of things I'd never even heard of before.
This guy is at the top of his profession, mind you, you wouldn't have just anybody fixing your defibrillators and what-not.
