I've known people live after being declared dead. One I remember is a middle aged lady who had CPR for the usual half hour or so, then declared dead by the Consultant Dr, no pulse, no signs of life, fish eye etc. The young student nurse was alone with the body preparing her for transport to the morgue when he found a faint carotid pulse. Lady went to ITU and now campaigns and fundraises for the installation of public CPR stations in her spare time (she went back to work). She's now a friend of mine. I refer to her as The Zombie in a jokey way but when I see her I see undead.