Walby A P, Barrera A, Schuknecht H F
Ann Otol Rhinol Laryngol Suppl. 1983 Mar-Apr;103 Suppl:1-19.
Chronic suppurative otitis media (COM) is reported to cause elevation of bone-conduction thresholds either by damage to cochlear sensorineural structures or by alteration in the mechanics of sound transmission in the ear. A retrospective study was made of the medical records of 87 patients with unilateral uncomplicated COM to document that abnormality in bone conduction does exist. In a separate study the cochlear pathology in 12 pairs of temporal bones with unilateral COM was studied by light microscopy. Infected ears showed higher than normal mean bone-conduction thresholds by amounts ranging from 1 dB at 500 Hz to 9.5 dB at 4,000 Hz. The temporal bones showed no greater loss of specialized sensorineural structures in infected ears than in normal control ears. Because there is no evidence that COM caused destruction of hair cells or cochlear neurons, alteration in the mechanics of sound transmission becomes a more plausible explanation for the hearing losses.
据报道，慢性化脓性中耳炎（COM）可通过损害耳蜗感觉神经结构或改变耳内声音传播机制导致骨导阈值升高。对87例单侧非复杂性COM患者的病历进行了回顾性研究，以证明骨导异常确实存在。在另一项研究中，通过光学显微镜对12对单侧COM颞骨的耳蜗病理进行了研究。感染耳的平均骨导阈值高于正常水平，范围从500Hz时的1dB到4000Hz时的9.5dB。与正常对照耳相比，感染耳颞骨中特殊感觉神经结构的损失并不更大。由于没有证据表明COM会导致毛细胞或耳蜗神经元的破坏，声音传播机制的改变成为听力损失更合理的解释。
