Originally Posted by Huckleberry3911948
i have heard many versions of this it seems a very grey area. people have fully come out of a coma after years of being "brain dead".
This is true, but there is a big difference between the brain not functioning (brain dead...coma...) and brain death where the cells have actually died from oxygen loss.
Those patients in a coma have a brain that can resume functioning to some extent. There is enough intact to do this. Those, where the brain cells have been destroyed, especially those involved in breathing, will not grow new cells. What's gone is gone.
The cells in the brain are unique. We don't grow new ones to replace those that have been destoyed.
Sometimes, the "brain dead" patient that recovers, was not properly diagnosed. At other times, it seems to depend on where the damage is done. Some brain function can be taken over by other parts of the brain. Breathing, seems to be one of those functions that can't.