Ishikawa K, Yasui N, Mineura K, Sasajima H, Togawa K
Department of Otolaryngology, Akita University School of Medicine, Japan.
Acta Otolaryngol Suppl. 1998;537:16-9. doi: 10.1080/00016489850182297-1.
In the past 10 years, 43 patients with acoustic neuroma have been operated on by the middle cranial fossa approach. In all cases, meticulous care was taken to preserve the cochlear function regardless of the degree of preoperative hearing disorder. Thirty-nine of 43 patients had various degrees of residual hearing, hearing was preserved in 16 of these (41%). The best result was obtained in patients with a tumor located less than 1 cm from the porus. The hearing preservation rate was 64% (11/17). The patients recovered hearing acuity quite well, especially at low frequencies in 2 cases who had a pure tone hearing level of more than 50 dB and less than 50% of speech discrimination. These 2 cases had a history of sudden deafness that was intractable 5 months preoperatively. Thus it is not correct to set certain criteria for hearing preservation for patients whose preoperative hearing may not be serviceable.
在过去10年中，43例听神经瘤患者接受了中颅窝入路手术。在所有病例中，无论术前听力障碍程度如何，均精心护理以保留耳蜗功能。43例患者中有39例有不同程度的残余听力，其中16例（41%）听力得以保留。肿瘤距内耳道小于1 cm的患者获得了最佳结果。听力保留率为64%（11/17）。患者听力恢复良好，尤其是2例纯音听力水平超过50 dB且言语辨别率低于50%的患者，低频听力恢复较好。这2例患者术前5个月有突发性耳聋病史且难以治疗。因此，为术前听力可能无法使用的患者设定某些听力保留标准是不正确的。
