聴力正常者の鐙骨筋反射に関する臨床的検討

概要

論文の詳細を見る
Thirty-four normal hearing subjects (23 males and 11 females) with the ages from 19 to 43, were submitted to impedance audiometry with Teledyne TA-2C acoustic impedance meter.Stapedial reflex thresholds (SRT) were evaluated by the change in impedance elicited by the 1000Hz tone applied either contralateral or ipsilateral ear. The results were summerized as follows.1) With a conventional method of recording stapedial reflexes, the mean values of SRT for contra and ipsilateral stimuli were 97.0dBSPL and 87.7dBSPL respectively, though the data showed 25dB-wide variation in both cases.2) Both variations of SRT due to the contractions of facial muscles, the increased pressure of ear canal, and the test-retest periods were significantly smaller than the variation observed among the normal hearing subjects.3) The SRTs showed no significant correlations with sex, age, hearing threhold level, uncomfortable loudness level, static compliance and ear canal volume of the subjects.4) The mean value of SRT for contralateral stimuli was always higher than that for ipsilateral ones by 9.3dB when compared separately with conventional recording procedure, but only 2.9dB when compared simultaneous recording procedure, the difference being significant (P<0.05).