Thornton A R, Kimm L, Kennedy C R, Cafarelli-Dees D
MRC Institute of Hearing Research, Royal South Hants Hospital, Southampton.
Br J Audiol. 1993 Oct;27(5):319-27. doi: 10.3109/03005369309076710.
Babies without any of the known risk factors for hearing impairment were taken from normal maternity wards and tested daily for 3 days post-partum. Tympanometric and evoked otoacoustic emission data were obtained from 121 babies. Middle-ear pressure and middle-ear compliance values were obtained with a Grason Stadler Middle-Ear Analyser (GSI-33) using a 1000-Hz probe tone. All babies had their evoked emissions measured on the Programmable Otoacoustic Emissions Measurement System (POEMS) equipment. The middle-ear compliance, the proportion of normally shaped tympanograms, the middle-ear pressure and the proportion passing EOAE testing all improved over the 3 days. However, the statistically significant factors affecting the pass rate appeared to be only the middle-ear pressure (for a small number of babies) and the degree of obstruction of the external ear canal. Whilst both these factors play a part in determining emission pass/fail rates they do not fully account for the observed changes in pass rate. There are developmental and other mechanisms which must contribute to the increase in pass rate as the baby matures.
没有任何已知听力障碍风险因素的婴儿从正常产科病房选取，并在产后3天每天进行测试。从121名婴儿身上获取了鼓室图和诱发耳声发射数据。使用Grason Stadler中耳分析仪（GSI-33），以1000赫兹探测音获取中耳压力和中耳顺应性值。所有婴儿都在可编程耳声发射测量系统（POEMS）设备上测量诱发耳声发射。在这3天里，中耳顺应性、正常形状鼓室图的比例、中耳压力以及通过耳声发射测试的比例均有所改善。然而，影响通过率的具有统计学意义的因素似乎只有中耳压力（对于少数婴儿而言）和外耳道阻塞程度。虽然这两个因素在确定发射通过/失败率方面都起作用，但它们并不能完全解释观察到的通过率变化。随着婴儿成熟，一定存在发育和其他机制导致通过率增加。
