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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.
Evaluation of Brain's Electrical Activity Important in Sleep, Seizures. The electrical activity of the brain is evaluated with an electroencephalogram (EEG) test used in sleep, seizures, coma, and brain death testing. Michel Tcherevkoff/The Image Bank/Getty Images.