jibi to rinsho
Online ISSN : 2185-1034
Print ISSN : 0447-7227
ISSN-L : 0447-7227
Electrocochleographic Study of Acoustic Neurinoma
Hidehaku KUMAGAMIHarumi MORIUCHIHirohide OHSAWAMitsuru MIYAZAKI
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1983 Volume 29 Issue 2 Pages 209-212

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Abstract
Electrocochleography was performed on twelve patients with acoustic neurinoma. Recordings were made with transtympanic needle electrode. Compound cochlear nerve action potential (AP) showed a lower threshold compared with that of the pure tone audiogram, and a well defined cochlear microphonic potential was observed. Some patients showed a well defined AP potential, although totally deaf. The AP with intense sound stimulation showed a low potential and/or a shallow input-output function slope. The above findings seem to result from retro-cochlear hearing impairment.
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