Karjalainen S, Kärjä J, Sorri M, Palva A
Audiology. 1984;23(1):53-8. doi: 10.3109/00206098409072821.
The material consisted of 21 patients with surgically confirmed eighth-nerve tumour and 107 patients with cochlear deafness. 13 (62%) of the patients with eighth-nerve tumour showed separated forward-backward tracings in sweep-frequency audiometry. One of the 13 patients gave an initially normal result but after the test ear had been exposed to 80 dB HL white noise for 3 min, the curves separated. Only 2 (1.9%) of the 107 patients with cochlear deafness had separated curves. Tone decay test revealed a pathological result in 67% of the patients with eighth-nerve tumour and in 26% of the cases with cochlear hearing loss. There is no single pathognomonic test for the diagnosis of retrocochlear and cochlear deafness. Diagnosis must be based on a whole battery of several tests, and among these, reverse frequency-sweep audiometry seems to be a suitable additional adaptation test. If an abnormal result is found in forward-backward sweep-frequency audiometry, a retrocochlear lesion is very probable.
该材料包括21例经手术证实患有第八神经肿瘤的患者和107例患有耳蜗性耳聋的患者。13例（62%）第八神经肿瘤患者在扫频听力测定中显示出前后描记分离。这13例患者中有1例最初结果正常，但在测试耳暴露于80 dB HL白噪声3分钟后，曲线分离。107例耳蜗性耳聋患者中只有2例（1.9%）有分离曲线。音衰试验显示，67%的第八神经肿瘤患者和26%的耳蜗性听力损失患者有病理结果。对于蜗后性和耳蜗性耳聋的诊断，没有单一的特征性检查。诊断必须基于一系列多项检查，其中，反向扫频听力测定似乎是一种合适的附加适应性检查。如果在前后扫频听力测定中发现异常结果，则很可能存在蜗后病变。
