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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.
1). Figure 1. A sample EEG recording showing a focal spike typical of a seizure. There are several different ways to conduct an EEG: 1  Standard EEG recording is done in the office and usually lasts an hour. 2  You may be asked to do a sleep-deprived EEG, which requires you to have only 4 hours of sleep.Abnormal brain waves may appear when the body is stressed or fatigued. This exam usually takes 2 to 3 hours. You will be given specific instructions regarding food, drink, and medications that may need to be avoided.). Figure 1. A sample EEG recording showing a focal spike typical of a seizure. There are several different ways to conduct an EEG: 1  Standard EEG recording is done in the office and usually lasts an hour. 2  You may be asked to do a sleep-deprived EEG, which requires you to have only 4 hours of sleep.