EEG monitoring of clinical coma

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Abstract
Twenty-four comatose patients were studied by 16-hour compressed spectral array (CSA), made from four-channel portable EEG recordings. Causes of coma included head injury (15), anoxia (6), and brainstem strokes (3). CSA was classified on the basis of frequency and alternating or nonalternating patterns. Alternating CSA was significantly associated with survival (p < 0.005) in the head-injured and anoxic group combined, and in the head-injured subgroup (p < 0.013). The prognostic value of CSA equaled the Glasgow Coma Scale or neurologic examination and occasionally added prognostic information.

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