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Application of DPOAE on early discovering of noise induced hearing loss

Objective To study the clinical efficacy of screening for noise induced hearing loss(NHIL)with distortion product otoacoustic emission(DPQAE) .Methods To mensure the noisy level of nine food package machines with acoustic metrology and the hearing levels were inspected 43 workers with pure tone and acoustic immitance and DPOAE, in the same time examining the outer ears and investigating time of noise endured,Result The average noise level of nine machines was 93.7dB(A),exceeding national regulation.Forty-three workers were normal with acoustic immitance and twenty-three workers were abnormal in hearing,seven of them were early and middle stage of noise induced hearing loss. Sixteen workers were normal with pure tone audiometry but abnormal with DPOAE.Conclusion DPOAE is a valuable method to detecte people enduring noise and discover NHIL earlier.
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