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KMID : 0858620030070010049
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Korean Journal of Audiology
2003 Volume.7 No. 1 p.49 ~ p.56
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Utilization of the Capella Distortion Product Otoacoustic Emission Analyzer for Screening the Noise Induced Hearing Loss
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Lee Jae-Suk
Lee Jung-Hak
Kim Yong-Bok
Kin Hyung-Jong
Kim Kyoo-Sang
Oh Sang-Yong
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Abstract
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Objective: Distortion product otoacoustic emission (DPOAE) can be used for screening the status of cochlea by ototoxic drugs or loud noise. The aim of this study was to find out the clinical utility of screening for noise induced hearing loss (NIHL) with the Capella distortion product otoacoustic emission (DPOAE) analyzer.
Design: A total of 82 subjects (161 ears), with normal hearing (34 persons) and mild-to-moderate NIHLs (48 persons) participated in this study. Among them, 67 ears were identified as normal and 94 ears as noise induced hearing loss. The sensitivity and specificity were examined for four screening criteria；absolute amplitude of -1 dBSPL at 4 kHz, absolute amplitudes of four frequencies, relative amplitudes of four frequencies, absolute and relative amplitudes.
Results: First, the audiometric thresholds and DPOAEs showed a higher correlation at high frequencies. Especially the correlation coefficient between the absolute amplitudes and relative amplitude of DPOAEs was the highest at 4 kHz. Second, sensitivity and specificity based on the absolute amplitudes of DPOAEs at 4 kHz of -1 dBSPL were 96% and 88% respectively. Third, as the absolute amplitudes were considered as critera (1 kHz：-3 dBSPL, 2 kHz：-4 dBSPL, 3 kHz：-5 dBSPL, 4 kHz：-3 dBSPL), the sensitivity and the specificity were 85% and 82% respectively. Fourth, when the relative amplitudes of critera were varied to +3, +6, and +9 dB, sensitivities were 17%, 27%, 84% respectively and specificities were 100%, 100%, 60% respectively. Fifth, when the absolute amplitudes (1 kHz：-3 dBSPL, 2 kHz：-4 dBSPL, 3 kHz：-5 dBSPL, 4 kHz：-3 dBSPL) of DPOAEs were fixed and the relative amplitudes were varied to +3, +6, and +9 dB, sensitivities were 85%, 85%, 93% respectively and specificities were 84%, 84%, 58% respectively.
Conclusion: According to these results, it is suggested that the Capella DPOAE analyzer be clinically useful as a screening equipment of NIHLs. But the clinical utility of this equipment for generalization should be further studied.
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KEYWORD
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Screening test, Distortion product otoacoustic emissions (DPOAEs), Noise induced hearing loss (NIHL)
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