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KMID : 0381320030420020057
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Korean Journal of Occupational Health
2003 Volume.42 No. 2 p.57 ~ p.66
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Study on DPOAE Audiogram of Noise-Induced Hearing Loss with Tinnitus
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Song Jue-Bok
Kim Jung-Il
Kim Byoung-Gwon
Kim Joon-Youn
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Abstract
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This study was performed to investigate the characteristics of distortion product otoacoustic emission (DPOAE) audiogram in noise exposed workers who were classified by hearing loss and noise-induced tinnitus (NIT). 7,204 noise exposed workers who had participated in noise-specific health examination in ship yard were surveyed to the tinnitus questionnaire and were conducted on the hearing threshold by pure tone audiometry. Of 7,204 noise exposed workers, 288 ears of 144 subjects selected by stratified random sampling according to hearing loss and NIT, and those were conducted on DPOAE audiogram. All examinee with known external or middle ear disorders were excluded. In DPOAE audiogram, distortion product and noise floor were elicited from L1=50 ㏈ SPL, L2=40 ㏈ SPL and F2/F1 ratio was set at 1.22.
The averaged D/N ratio gram of normal hearing group was significantly different from that of high frequency hearing loss group and sensory hearing loss group. In multiple comparison test, average D/N ratio of normal hearing group was significantly different from that of high frequency hearing loss group and sensory hearing loss group at 1, 2, 4 ㎑. Significant decreases in average D/N ratio at 8000 ㎐ and averaged D/N ratio grams were observed between normal hearing group with tinnitus and normal hearing group without tinnitus(p＜0.01).
The data support that DPOAE audiogram of noise induced hearing loss and NIT may be useful in diagnosis and management of noise induced hearing loss and NIT noise exposed population and encourage noise exposed population to cooperate more actively in a hearing conservation program.
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KEYWORD
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Noise induced tinnitus, Distortion Product otoacoustic emission
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