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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.
In an unconscious patient, assessing the severity of a potential head injury means having to wake him up. In fact, how easy it is to wake him up is part of the Glasgow Coma Scale. The scale is probably the worst scoring system in emergency medicine (follow along and you'll see why).