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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.
An electroencephalogram (EEG) may be done to: 1  Diagnose epilepsy and see what type of seizures are occurring. 2  Check for problems with loss of consciousness or dementia. 3  Help find out a person's chance of recovery after a change in consciousness. 4  Find out if a person who is in a coma is brain-dead. 5  Study sleep disorders, such as narcolepsy. 6  Watch ...hese medicines can affect your brain's usual electrical activity and cause abnormal test results. Do not eat or drink foods that have caffeine (such as coffee, tea, cola, and chocolate) for 12 hours before the test.