Plinkert P K, Ptok M
Universitäts-HNO-Klinik Tübingen.
HNO. 1994 Jul;42(7):434-40.
Middle ear impedance plays an important role in the retrograde middle ear transfer and interpretation of otoacoustic emissions (OAE). Changes of emission spectra and reproducibility or absence of sound emissions can be caused by middle ear dysfunction. To avoid misinterpretation, especially in infant screening, we combined measurements of transiently-evoked otoacoustic emissions (TEOAE), distortion products (DPOAE) and middle ear pressure. With a single acoustic probe ear canal baro-pressure was adjusted individually to the middle ear pressure, allowing OAE to be measured at maximum compliance of the middle ear. Fifty children (ages, 3-8 years) were examined with hypoventilation of the middle ear. Twenty-five normally hearing adults were also studied. Positive and negative middle ear pressures significantly attenuated the amplitude of low-frequency OAE (< 2 kHz), whereas high-frequency emissions were stable. Individual adaptations of static ear canal pressure eliminated these alterations of TEOAE and DPOAE.
中耳阻抗在耳声发射（OAE）的逆行中耳传递及解读中起着重要作用。中耳功能障碍可导致发射频谱的变化、声发射再现性的改变或声发射缺失。为避免误判，尤其是在婴儿筛查中，我们将瞬态诱发耳声发射（TEOAE）、畸变产物耳声发射（DPOAE）测量与中耳压力测量相结合。使用单个声学探头，将耳道气压分别调整至中耳压力，使OAE能在中耳最大顺应性状态下进行测量。对50名中耳通气不足的儿童（年龄3至8岁）进行了检查。还对25名听力正常的成年人进行了研究。中耳正压和负压均显著衰减了低频OAE（<2kHz）的幅度，而高频发射则保持稳定。耳道静态压力的个体化调整消除了TEOAE和DPOAE的这些变化。
