音響刺激性後耳介反応の他覚的聴力測定への応用についての検討
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概要
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The present study was mainly concerned with significane of the clinical use of post-auricular myogenic evoked response as the objective audiometry. The response to acoustic stimuli of clicks and pure tone bursts was recorded from the skin surface behind the pinna by means of the ave-rage response computer. In addition, the cochlear nerve action potential (AP) was recorded from the promontrium using a transtympanic electrode, with the post-auricular response simultan-eously. Twentytwo subjects with normal hearing and four patients with various types of hearing loss were tested. The following results were obtained.1) The post-auricular response showed a biphasic waveform, that is an initial negative peak followed by a positive one. The amplitude of the response was varied to the high extent across subjects, but the latency of it was relatively stable.2) The thresholds of the response to clicks in normal hearing subjects were as low as the values of the subjective thresholds. The response to pure tone bursts showed higher thresholds than that to cliks.3) The response failed to be recorded in 5 subjects with normal hearing.4) The response could be recorded not only from subjects in awake but also from subjects in sedation.5) The threshold of the post-auricular response highly correlated with that of the AP in patients with various type of hearing loss.6) It can be said that the post-auricular response might serve as a very useful index for object ive audiometry.
- 社団法人 日本耳鼻咽喉科学会の論文