Lehnhardt E, Samii M
Laryngol Rhinol Otol (Stuttg). 1982 Sep;61(9):501-4.
We report on patients from a combined neurosurgical neuro-otological group (N = 36) in whom we were able to show that in tumours of the posterior cranial fossa, the acoustic evoked potentials may be -normal on the healthy side; -delayed on the healthy side, too, and improved post-operatively; -delayed on the healthy side postoperatively only. The relevant constellation of findings is mainly determined by the localization and size of the tumour, and hence by compression of the brain stem with or without occlusive hydrocephalus in the fourth ventricle. The observations suggest that mere comparison of the latency differences of both sides does not exhaust the possibilities of ERA; and, rather, that it is necessary to record the responses from both sides over the usual audiometric range of sound intensity and to correlate them both to the norm latencies and to the individual audiometric image.
我们报告了一个神经外科与神经耳科学联合治疗组的患者（N = 36），我们能够证明，在后颅窝肿瘤患者中，听觉诱发电位可能会出现以下情况：健侧正常；健侧也延迟，但术后改善；仅术后健侧延迟。相关的检查结果组合主要由肿瘤的位置和大小决定，进而由脑干受压情况以及第四脑室有无梗阻性脑积水决定。这些观察结果表明，仅仅比较两侧的潜伏期差异并不能充分利用听觉脑干反应（ERA）的可能性；相反，有必要在通常的听力计声音强度范围内记录两侧的反应，并将它们与正常潜伏期以及个体听力图相关联。
