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Revista Brasileira de Otorrinolaringologia

Print version ISSN 0034-7299


MARQUES, Frederico Prudente  and  COSTA, Everardo Andrade da. Exposure to occupational noise: otoacoustic emissions test alterations. Rev. Bras. Otorrinolaringol. [online]. 2006, vol.72, n.3, pp.362-366. ISSN 0034-7299.

Exposure to occupational noise may cause injuries to the inner ear, and the distortion product otoacoustic emissions (DPOAE) may identify initial auditory alterations, thus assisting NIHL early diagnosis. AIM: The goal of this study was to evaluate DPOAE as a method to diagnose early physiopathological alterations caused by occupational noise exposure. STUDY DESIGN: Transversal. METHODS: 74 workers of the University of São Paulo, in the capital city of the State, participated in this investigation. They were divided in two age-matched groups and with tonal audiometric values within the acceptable limits: 37 were exposed to occupational noise and 37 were not exposed. RESULTS: Risk estimates (Odds Ratio) of absent DPOAE was 12 fold higher for the group exposed to occupational noise (CI 95% 3.1 - 45.9), in the frequencies of 3. 4 and 6 kHz. CONCLUSION: DPOAE may be useful in the identification of physiopathological hearing alterations caused by exposure to occupational noise, even in individuals with tonal audiometric responses within acceptable limits.

Keywords : otoacoustics emissions; hearing loss; occupational noise.

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