Just a bit of curiosity here, I'm not aware of anyone in my family under similar circumstances, the following came up in a chat with my wife.
Let's say that I have a heart attack, bad accident, stroke, etc and cannot easily communicate my wishes, however my wife knows very well that I would never want to stay in hospital if I was thoroughly miserable with little or no hope of recovery and if I was suffering. I'd rather be at home.
Even if the doctors advise against it, can my wife (for example) remove me from hospital? Can she, with the help of a friend for example, just put me in a wheelchair and wheel me out?
In fact, should I be making some kind of 'living will' to state my wishes and put them on file should such an event occur? That way the hospital would have it in writing that I wouldn't want to remain there.