Brainstem auditory and short-latency somatosensory evoked responses in brain death.

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 responses. Of the brain-dead patients, 77% had no waves present in the BAER, including wave I, whereas 69% had medullary 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 established 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 not brain-dead patients.