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A coma is totally different to being brain dead or even being a "vegetable" the terms are not interchangeable. If you are brain dead your brain ceases to function, the only thing keeping your body alive are machines. If you are in a coma you still have tons of brain activity. You don't need machines for your organs to function although machines are used to monitor organ functions and brain activity.
If you are brain dead you ain't coming back from that shit.
The stories you hear of people "coming back from the dead" are usually people in comas that are misdiagnosed because the person pronouncing death, didn't bother to or weren't able to check for brain function. Also it seems that Bobbi Kristina Brown was never actually pronounced brain dead, and her family never really intended to take her off life support.
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