听神经瘤引起突发性听力减退

为了避免听神经瘤的误诊误治，对１９８６￣１９９５年收治听神经瘤１０４例中２３例（２４耳）首发症状表现为突发性听力减退者（占２３％）的病例进行分析。听力学检测：纯音听阈〉７１ｄＢ ＨＬ者１３耳，占５４．２％，听性脑干反应（ＡＢＲ）检测均有异常；耳蜗电图－ＳＰ／ＡＰ检测９耳中７耳〉０．４，占７７．８％，声反射检测１１耳均消失。眼震电图检测１８例，１７例异常（占９４．４％），影像学检查ＣＴ阳性率８８．８

Sudden hearing loss in acoustic neuroma]

To avoid misdiagnosis and mistherapy of acoustic neuroma, 104 cases of acoustic neuroma treated between 1986 and 1995 were retrospectively reviewed. Among them, 23 patients (24 ears, 23%) presented with sudden hearing loss as the starting symptoms. The clinical and audiological analysis demonstrated that 54.2% of the ears showed hearing loss over 71 dB HL, and all ears had deteriorated ABRs. -SP/AP was measured in nine ears, seven showed -SP/AP greater than 0.4. Acoustic reflex was negative in all 11 ears tested, and 94.4% of the ears showed abnormal ENG. The rate of positive CT scan was 88.8%. The diagnosis was made with CT pneumo-encephalography or MRI in those with negative CT result. It was concluded that for patients with sudden deafness, ABR should be used as a routine test. When ABR was abnormal, CT scan of the internal auditory meatus was needed.