Abstract
The Electrocochleography (ECoG) findings obtained from 43-year-old woman with an acoustic tumor were studied pre-, per- and post-operatively. Although Compound Action Potential (CAP) presented a normal wavef orm in response to click during the whole process of surgical manipulation, it was transformed in shape into an abnormally broadened negative waveform with mild hearing exacerbation, and it remains unchanged to date.This broad response was considered to be a receptor potential, because it showed no adaptational amplitude reduction. Additionally, postoperative ECoG to tone burst stimuli demonstrated an increase in DC potential following stimulus envelope. Consequently, a broad negative response to click was considered to be mainly composed of an enlarged negative SP.The generation mechanism underlying the phenomenon of an abnormally increased negative SP following excision of an acoustic neuroma was discussed along with several references.CAP as an indicator for intraoperative monitoring may scarecely predict the postoperative auditory function. The establishment of a more reliable monitoring method is required for surgery on cerebellopontine angle tumors.
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