Not having a heartbeat and not breathing doesn’t mean you’re dead. Intensive care departments are literally full of people with medically paralysed breathing muscles (i.e. not breathing) on ventilation machines. People go onto heart/lung bypass machines everyday to have heart surgery and their heart is stopped. You just need to keep oxygenated blood going around, keeping those tissues alive till you get the heart and breathing back online (this is what CPR is trying to do).
When the brain stem is dead tissue, then you’re truly dead (but even then you can be kept “alive” artificially if you’re already on a ventilation machine in a suitable intensive care).
Not having a heartbeat and not breathing doesn’t mean you’re dead. Intensive care departments are literally full of people with medically paralysed breathing muscles (i.e. not breathing) on ventilation machines. People go onto heart/lung bypass machines everyday to have heart surgery and their heart is stopped. You just need to keep oxygenated blood going around, keeping those tissues alive till you get the heart and breathing back online (this is what CPR is trying to do).
When the brain stem is dead tissue, then you’re truly dead (but even then you can be kept “alive” artificially if you’re already on a ventilation machine in a suitable intensive care).
When your heart stops, you are considered dead no matter how viable your brain tissue is.
Source: I have pronounced many persons dead.