AP,BSR,MLR及びSVRの同時記録法による観察

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AP, BSR, MLR and SVR were recorded from 14 normal subjects and 16 adults with inner ear deafness using the so-called simultaneous recording.These results obtained from this survey were as follows:1) Mean thresholds of these responses in normal subjects were: AP-16.1±10.1dB SL, BSR(V)-23.6±8.4dB SL, MLR(Pa)-22.4±10.9dB SL, SVR(NI)-50.9±22.6dB SL. In some cases, the responses with a later latency showed a lower threshold than the response with an earlier latency.2) In subjects with inner ear deafness, it was considered that AP was most reliable to measure the threshold, though it was not always in parallel with threshold for pure tone. The later the latency was, the more difficult to obtain the responses.3) The latency of AP and BSR decreased as a function of intensity, but there was no significant change in latencies of MLR and SVR.4) In the repeated examinations on an individual subject, the response with longer latency tended to show the changes in the waveforme, the peak latency and the amplitude of each trial, and consequently there were no test reliability for this long latency response.It was concluded that it was necessary to observe various kinds of the responses in examining the hearing thresholds though AP was the most reliable response, and to pay attention to the distinction of each response in neurological examinations.
一般社団法人日本耳鼻咽喉科学会の論文