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EEG monitoring of clinical coma

The compressed spectral array

Department of Neurosciences and the Division of Neurosurgery, University of California, San Diego, CA.

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.

Address correspondence and reprint requests to Dr. Karnaze, Department of Neurology, Room 5641, University of California School of Medicine, 2025 Zonal Avenue, Los Angeles, CA 90033.

This work was supported in part by NIH Grant No. PHS-NS-08962 and the Neurosciences Institute of Los Angeles, California.

Accepted for publication August 11, 1981.

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