Symon L, Sabin H I, Bentivoglio P, Cheesman A D, Prasher D, Barratt H
Gough-Cooper Department of Neurological Surgery, National Hospital, London, U.K.
Acta Neurochir Suppl (Wien). 1988;42:27-30. doi: 10.1007/978-3-7091-8975-7_6.
We have monitored the electrocochleogram (ECochG) of 24 patients, using a transtympanic electrode, during acoustic neuroma excision. All patients had unilateral tumours with good preoperative hearing and complete excision was achieved in each case. Of the 24 patients, seven retained some hearing, however, a further two patients had normal ECochG waveforms at the end of operation but were nevertheless deaf. Thus, there is not an invariable correlation between immediate preservation of the ECochG and hearing. As expected, tumour size was important in hearing preservation. Five of seven patients with tumours less than 1.5 cm in diameter retained some hearing after operation, whereas 15 of 17 patients with tumours greater than 1.5 cm in diameter were deaf.
我们在听神经瘤切除术中使用经鼓膜电极监测了24例患者的耳蜗电图（ECochG）。所有患者均为单侧肿瘤，术前听力良好，且每例均实现了完全切除。在这24例患者中，7例保留了一定听力，然而，另有2例患者在手术结束时耳蜗电图波形正常，但仍失聪。因此，耳蜗电图的即刻保留与听力之间并非存在不变的相关性。正如预期的那样，肿瘤大小对听力保留很重要。7例直径小于1.5 cm的肿瘤患者中有5例术后保留了一定听力，而17例直径大于1.5 cm的肿瘤患者中有15例失聪。
