No, why would it? Why do you assume they've ceased to exist? Resuscitation is not recreation or re-instantiation. A person prior to resuscitation isn't dead. Ra

No, why would it? Why do you assume they've ceased to exist? Resuscitation is not recreation or re-instantiation. A person prior to resuscitation isn't dead. Rather, some function has ceased (cardiac arrest, for instance) which can, if his state persists, result in death because it will eventually cause all functions to cease and allow decay to begin. What you have in mind is not so much a philosophical problem per se, but a medical or even a biological problem, i.e., at which point is resuscitation no longer possible even in principle? When is there no longer the potential to resuscitate? That would be the point at which the existence of something has ended.