Electroencephalography (EEG): The electroencephalogram (EEG) is a test that measures brain waves. It is used to evaluate brain disorders. The test is painless and very few risks are associated with an EEG.
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Coma Coma is a state of unconsciousness in which the patient does not consiously respond to the environment and stimuli. Causes of coma include head trauma, bleeding in the brain, skull fractures, brain swelling, lack of oxygen to the brain, poisons, and endocrine disorders. The Glasgow Coma Scale is a tool physicians use to rate the depth of coma of a patient. The outlook of coma for a patient depends on the cause of the coma and the damage to the brain and other organs of the patient's body.