Resuscitation, A rule that's dying to be written... Options

[NightmareX]

I've been wondering for a while now, how would the medical resusicitation of a dead (flatlined, no pulse, no breathing, no or minimal EKG) character work in SR4? Could it be accomplished, and if so what kind of time limits are we talking about? Like 5-10 minutes after clinical death, or less? Or would this sort of rule be unnecessary, already covered by overdamage (my gut says no, but it has been known to be wrong)?

Further, if medical resusitations are mechanically possible, how about magical resuscitation? I know about the "no raising the dead" limitation on sorcery, but that isn't exactly what I'm talking about here. To clarify, I'm talking resuscitating a recently (one hour absolute max) dead character whose body is reasonably intact - not D&D style resurrection bs. Obviously, something like this would be bleeding edge research, which would make a great Macguffin.

So, ideas anyone?