Abstract
The auditory brain-stem response (ABR) recordings of 40 patients who underwent microvascular decompression of cranial nerves V and VII were analyzed. The latencies of waves I, V, and the I-V interpeak interval were examined as a function of subject age, subject gender, operative site, and operative stage. The results indicated that: (1) subject age was not a significant factor in intraoperative ABR variability; (2) significant male-female latency differences were present only in the earlier operative stages; (3) greater latency changes were produced during decompression of the facial nerve than during trigeminal nerve decompression; and (4) greater response variability was present during the later operative stages. The patients' postoperative auditory status was studied to determine the predictive efficiency of three currently used criteria for significant intraoperative latency change.
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