Measurement of noise effects in a discotheque by means of otoacoustic emissions.

Author(s): Delb, W., Andes, C., Koch, A.

Journal/Book: Laryngo Rhino Otol. 1996; 75: P O Box 30 11 20, D-70451 Stuttgart, Germany. Georg Thieme Verlag. 259-264.

Abstract: Background: The aim of the study was to investigate the potential and difference of pure tone audiogram, TEOAE and DPOAE in the detection of temporary threshold shift. Methods: 46 disco visitors who were exposed to disco music at an average intensity of 105 dB (A) for 1, 11/2 and 2 hours respectively underwent audiological examination before and after noise exposure. Audiological measurements performed were an audiogram and measurements of the TEOAE and DPOAE using the system ILO 92 (Otodynamics). Results: The frequency range where the threshold shift occurred was around 4000 Hz in the 1 hour group and spread over all frequencies when the exposure time increased. The average threshold shift over all frequencies and probands was 6.2 dB for the 1 hour group, 7.1 dB for the 11/2 hour group and 10.1 dB after 2 hours of noise exposure. TEOAE amplitudes showed significant reduction only at 2000 and 3000 Hz. Even at threshold shifts exceeding 15 dB, however not in all cases, a reduction of TEOAE amplitudes occurred, Similar results were obtained regarding the DPOAE measurements. Conclusions: We conclude that TEOAE and DPOAE are not ideal instruments in the detection of temporary threshold shift after noise exposure.

Note: Article W Delb, Univ Homburg, Hno Klin, D-66421 Homburg, Germany

Keyword(s): otoacoustic emissions; hearing loss; noise induced; noise; occupational; temporary threshold shift; audiometry

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