Schmuziger N, Hauser R, Probst R
Universitáats-HNO-Klinik, Kantonsspital Basel.
HNO. 1996 Jun;44(6):319-23.
Both the amplitude and power spectra of otoacoustic emissions are affected by the transfer properties of the middle ear. This prospective study examined the influence of eustachian tube dysfunction on transiently evoked otoacoustic emissions (TEOAEs) and distortion-product otoacoustic emissions (DPOAEs). In all, 18 ears were studied that exhibited negative middle ear pressures with or without middle ear fluid. Measurements were performed at the time of diagnosis during the recovery stage, and after the middle ear became normally ventilated. Findings showed that TEOAE and DPOAE levels increased while airbone gaps were reduced by an average of 8 dB after negative middle ear pressures returned from -400 daPa to a normal state. There was a tendency for negative middle ear pressure to affect DPOAEs more in the 1-kHz region than in higher frequencies. By contrast, TEOAEs and airbone gaps were more uniformly affected across the entire frequency range. These results for ears with eustachian tube dysfunction were somewhat different from those results of studies obtained in healthy ears tested during experimental changes in middle ear pressure.
耳声发射的振幅和功率谱均受中耳传递特性的影响。这项前瞻性研究考察了咽鼓管功能障碍对瞬态诱发耳声发射（TEOAEs）和畸变产物耳声发射（DPOAEs）的影响。总共对18只耳朵进行了研究，这些耳朵表现出中耳负压，伴有或不伴有中耳积液。在诊断时、恢复阶段以及中耳恢复正常通气后进行测量。结果显示，当中耳负压从-400 daPa恢复到正常状态后，TEOAE和DPOAE水平升高，气骨导间距平均减小8 dB。中耳负压在1 kHz区域对DPOAEs的影响比对高频区域的影响更大。相比之下，TEOAEs和气骨导间距在整个频率范围内受到的影响更为均匀。这些咽鼓管功能障碍耳朵的结果与在中耳压力实验性变化期间对健康耳朵进行测试所获得的研究结果有所不同。
