摘要
目的 探讨扩展高频测听 (1 0～ 2 0kHz)在噪声性听力损失早期诊断中的作用及不同年龄、工龄、暴露噪声的强度与 1 0～ 2 0kHz听阈损失的关系。方法 应用频率范围为 0 5～ 2 0kHz的纯音听力计对 1 0 0 0名噪声下作业工人的听力进行检测 ,以 1 2 0名不同年龄的健康人作为对照组。结果在 95～ 1 1 5dB(A)的噪声强度下 ,当 0 5～ 6kHz的阈值未出现异常时 ,1 0～ 1 8kHz的阈值明显高于对照组 (1 0～ 1 6kHzP <0 0 0 1 ,1 8kHzP <0 0 1 ) ,对最大输出没有反应耳数的比率明显高于对照组 (1 4～2 0kHzP <0 0 1 )。接触噪声的各年龄组 1 0～ 1 8kHz阈值随年龄的增长而升高 ;不同工龄组比较 ,6～1 0年工龄组的 1 0～ 1 8kHz阈值明显升高 ;不同噪声强度组的 1 0～ 2 0kHz阈值比较差异无显著性 (P >0 0 5 )。结论 高强度噪声引起的听力损失 ,1 0～ 2 0kHz听阈的变化早于 0 5～ 6kHz,年龄和工龄影响1 0～ 2 0kHz听阈 ,其对最大输出引不出反应和听阈阈值的变化可作为早期检测噪声性听力损失及噪声易感者的指标。
Objective To assess the application of 10～20 kHz audiometry in early diagnosis of noise induced hearing loss and to explore the relationship between hearing loss and subjects' age, the exposure time as well as the noise level Methods One thousand workers with noise exposure history were examined by pure tone audiometry(0 5～20 kHz) One hundred and twenty normal subjects served as the control group Results The noise levels at working sites ranged from 95 to 115dB(A) Compared with the control group, noise exposed subjects showed minor changes in the thresholds from 0 5 to 6 kHz, whereas the thresholds were elevated in the high frequency range of 10～16 kHz ( P <0 001) The incidence of ears without any response to the maximum output at the frequency range of 14 to 20 kHz was much higher ( P <0 01)than that of the control group In the animals exposed to noise, the thresholds of 10～18 kHz increased with the aging and with increase of working time (6～10 years), but there were no significant differences among subjects exposed to the noises at different levels( P >0 05). Conclusion In noise exposed ears, the occurrence of threshold changes in the high frequency range (10 to 20 kHz) is earlier than that in the low frequency range (0 5 to 6 kHz) Aging and working time also affect the 10～20 kHz hearing thresholds The lack of responses to maximum output and the changes in thresholds in the high frequency range (10～20 kHz) can be used as indices for the diagnosis of early noise induced hearing loss and for the assessment of the susceptibility of the subject to noise damage
出处
《中华耳鼻咽喉科杂志》
CSCD
2000年第1期26-28,共3页
Chinese Journal of Otorhinolaryngology
基金
吉林省科技发展计划资助!( 970 3 3 8)
关键词
听力损失
噪音性
扩展高频测听
早期诊断
Hearing loss, high frequency
Hearing loss, noise induced
Noise, occupational
Diagnosis
Audiometry, pure tone
