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- 井上 庸夫
- 獨協医科大学越谷病院耳鼻咽喉科
書誌事項
- タイトル別名
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- Practical Study of Evoked Otoacoustic Emissions Concerning Individual Variation of Noise Susceptibility.
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抄録
There are large individual differences in susceptibility to noise exposure. Most hearing impairment begins with dip type hearing loss, and continual evoked otoacoustic emissions (CEOAES) are frequently seen in ears with dip type hearing loss. The present study was performed in order to ascertain the relationship between dip type hearing loss and C-EOAE.<br>Brass band members in two junior high schools were the subjects of this study. In H-school, the noise levels during practice were between 88 and 103 dB Leq in all groups with music instrumental parts. The survey revealed that 58% of ears showed dip type hearing loss in Bekesy's audiogram and 52% showed of C-EOAE. The incidence of dip was 82% in ears with C-EOAE, and 35% in the ears without C-EOAE. In the brass band members of F-school the incidence of ears having dip was 64% and the incidence of C-EOAE was 56%. The incidence of dip was 81% in the ears with C-EOAE, whereas it was 43% in the ears without C-EOAE.<br>Follow-up studies in the subjects of H-school revealed that the incidence of dip ears decreased from 58% to 45%, whereas the incidence of C-EOAE changed in only one ear and was maintained at 50%, near the initial value. Four ears changed in of dip without any change in the presence of C-EOAE.<br>This practical survey showed a clear relationship between the presence of dip and of C-EOAE.In addition, the follow-up survey indicated that change in the presence of dip does not follow the change in the presence of C-EOAE. The results suggest that the C-EOAE seems to express a disposition to susceptibility in to damage the intracochlear micromechanics. The measurement of C-EOAE may be useful for predicting individual differences in the susceptibility to noise exposure.
収録刊行物
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- 日本耳鼻咽喉科学会会報
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日本耳鼻咽喉科学会会報 97 (1), 75-83, 1994
一般社団法人 日本耳鼻咽喉科頭頸部外科学会