1½ - 2" in depth for compressions on an adult is typical, so definitely expect broken ribs and grinding bones (crepitus). Chances of actually reviving a patient from CPR alone are around 2% last I saw. But CPR is often mis-used in old TV shows. Defibrillators are typically mis-used in TV and such frequently, for dramatic effect.
I've never done it, but I know those who have. I was kind of bummed out that I wasn't able to try it on my practicum. Don't get me wrong; I was also glad I didn't have to do it too - I don't want to see people in that type of situation - but experience is a great learning tool for that field of work.
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