Liebel J, Delb W, Andes C, Koch A
Universitäts HNO-Klinik, Homburg.
Laryngorhinootologie. 1996 May;75(5):259-64. doi: 10.1055/s-2007-997575.
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.
46 disco visitors who were exposed to disco music at an average intensity of 105 dB (A) for 1, 1 1/2 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).
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 1 1/2 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.
We conclude that TEOAE and DPOAE are not ideal instruments in the detection of temporary threshold shift after noise exposure.
本研究旨在探讨纯音听力图、瞬态诱发耳声发射（TEOAE）和畸变产物耳声发射（DPOAE）在检测暂时性阈移方面的潜力和差异。
46名迪斯科舞厅访客分别在平均强度为105 dB（A）的迪斯科音乐环境中暴露1小时、1个半小时和2小时，在噪声暴露前后接受听力检查。进行的听力测量包括听力图以及使用ILO 92系统（Otodynamics公司）测量TEOAE和DPOAE。
1小时组中发生阈移的频率范围在4000 Hz左右，随着暴露时间增加，阈移频率范围扩展至所有频率。在所有频率和受试者中，1小时组的平均阈移为6.2 dB，1个半小时组为7.1 dB，噪声暴露2小时后为10.1 dB。TEOAE幅值仅在2000 Hz和3000 Hz处显著降低。然而，即使阈移超过15 dB，TEOAE幅值也并非在所有情况下都会降低。DPOAE测量也得到了类似结果。
我们得出结论，TEOAE和DPOAE并非检测噪声暴露后暂时性阈移的理想工具。
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