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To determine âcessation of all functions of the entire brain, including the brain stem,â physicians must determine the presence of unresponsive coma, the absence of brainstem reflexes, and the absence of respiratory drive after a CO 2 challenge.
exists and is an alternate of . 3 to 5 minutes to brain death is normal, anything over 5 minutes will result in permanent brain damage, but people have been drowned in very cold water and recovered after hours of no oxygen, the rapid loss of body temperature saved the brain tissue by slowing brain cell deterioration. Up to 16 minutes.