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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.
Brain death is a legal definition of death. It is the complete and irreversible cessation (stopping) of all brain function. It means that, as a result of severe trauma or injury to the brain, the body's blood supply to the brain is blocked, and the brain dies.Brain death is death.It is permanent and irreversible.rain death is a legal definition of death. It is the complete and irreversible cessation (stopping) of all brain function. It means that, as a result of severe trauma or injury to the brain, the body's blood supply to the brain is blocked, and the brain dies. Brain death is death. It is permanent and irreversible.