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From the Robert S. Schwab Computer Facility of the Clinical Neurophysiology Laboratory, Department of Neurology, Maiasachusetts General Hospital, and Harvard Medical School, Boston, MA.
Thirty-five patients who met all clinical criteria for brain death and 53 patients who did not were tested with brainstem auditory (BAER) and short-latency somatosensory (SER) evoked resonses. Of the brain-dead patients, 77% had no waves present in the BAER, including wave I, whereas 69% had medulla components present in the SER. These data suggest that the SER has greater clinical utility in the brain-death setting, because it is important to have a wave present that establishes that the input signal has reached the central nervous system. No brain-dead patients had subsequent waves in either test. These results are correlated with neuropathologic findings and contrasted with data obtained in the comatose but riot brain-dead patients.
Address correspondence and reprint requests to Dr. Chiappa, Department ol' Neurology, Massachusetts General Hospital, Fruit Street, Boston, MA 02114.
Supported in part by the Edwin Minot Fund for Research in Electroencephalography.
Presented in part at the thirty-first annual meeting of the American Academy of Neurology, Chicago, IL, April 1979.
Accepted for publication June 12, 1980.
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