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  • Title: [Application of extended high frequency audiometry in the early diagnosis of noise--induced hearing loss].
    Author: Wang Y, Yang B, Li Y, Hou L, Hu Y, Han Y.
    Journal: Zhonghua Er Bi Yan Hou Ke Za Zhi; 2000 Feb; 35(1):26-8. PubMed ID: 12768684.
    Abstract:
    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.
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