like that one tom clancy game, ghost recon.
That sounds good, but maybe have it so you have very little health, and any damage of any kind will kill you.
But with basically 1 additional health point there is no need for defibrillators. You won't be able to use any items when near-dead and people will just shoot at you a bit longer so you are really dead.
Also they work now. Very basic, but they work.