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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.
The asphyxiated brain loses consciousness in a maximum of 10 seconds, and minutes later the brain dies. Decapitation was believed to be rapid and painless, but it takes about 7 seconds for the brain to lose consciousness.