소음성 난청 환자에서 전기와우도의 변화

초록

Background and Objectives：Electrocochleography (ECoG) is a sensitive evoked-response test for evaluating changes in co-chlear function. We investigated the extratympanic ECoG in noise-induced temporary and permanent threshold shift to evaluate the usefulness of ECoG in the early detection and monitoring of noise-induced hearing loss (NIHL). Subjects and Method：(TTS). Pure-tone audiometry and ECoG were performed before (control-group), immediately after (TTS-group), and 24 hours after the exposure. And ECoG was measured in 27 ears with noise-induced permanent threshold shift (PTS-group). Results：The mean amplitude of SP (sumating potential) was greatest in the TTS-group. The largest increment in the SP/AP (action potential) ratio was also observed in the TTS-group. ± 0.11, 0.46± 0.18 and 0.37± 0.10, respectively. The PTS-group showed the smallest mean amplitude of AP. Conclusion：The results of this study suggest that SP, AP and the SP/AP ratio might be sensitive parameters reflecting the changes of cochlear function in NIHL.

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