Browning G G, Gatehouse S
University of Glasgow, Scotland.
Ann Otol Rhinol Laryngol. 1989 Apr;98(4 Pt 1):245-50. doi: 10.1177/000348948909800402.
In individuals with chronic otitis media, mixed hearing impairments are common but it is unclear whether the raised bone conduction thresholds are a reflection of the pathologic process affecting the inner ear or a combination of the high prevalence of sensorineural hearing impairments in the population along with the artificial elevation of bone conduction thresholds associated with a conductive defect. A total of 395 ears with chronic otitis media but without cholesteatoma were studied. In them, once the artificial elevation (Carhart effect) of the bone conduction thresholds, which occurs whenever there is an abnormality of the sound conduction mechanism, had been taken into account, there was no difference in the bone conduction thresholds compared with those in 920 control ears. In addition, in 100 instances, the contralateral ear was normal and there was no difference in the bone conduction thresholds between the diseased and the normal ears. Raised bone conduction thresholds in chronic otitis media are considerably likely to reflect both the Carhart effect and the high prevalence of sensorineural impairments, rather than disease damage to the inner ear.
在慢性中耳炎患者中，混合性听力障碍很常见，但目前尚不清楚骨导阈值升高是反映了影响内耳的病理过程，还是人群中感音神经性听力障碍的高患病率以及与传导性缺陷相关的骨导阈值人工升高的综合结果。本研究共纳入了395例无胆脂瘤的慢性中耳炎患者的耳。在这些患者中，一旦考虑到每当声音传导机制出现异常时就会发生的骨导阈值人工升高（卡哈特效应），其骨导阈值与920例对照耳相比并无差异。此外，在100例患者中，对侧耳正常，患耳与正常耳的骨导阈值也无差异。慢性中耳炎患者骨导阈值升高很可能反映了卡哈特效应和感音神经性损伤的高患病率，而非内耳的疾病损害。
