Jacobson G P, Butcher J A, Newman C W, Monsell E M
Department of Otolaryngology-Head and Neck Surgery, Henry Ford Hospital, Detroit, Michigan 48202, USA.
J Am Acad Audiol. 1995 Jul;6(4):346-9.
The electronystagmographic auditory brainstem response and magnetic resonance imaging findings for a 33-year-old male with a 3.5 cm left vestibular schwannoma are presented. Of particular interest was the presence of an unusual positioning nystagmus following the Dix-Hallpike maneuver in the right head-hanging position. The patient demonstrated a nystagmus that was immediate in onset and not fatigueable upon repeated positioning. During positioning, the patient experienced a vertical bobbing sensation and dysphoria, but not rotational vertigo. Most importantly, the nystagmus had a predominant downbeating vertical component. the case illustrates the diagnostic significance of downbeating nystagmus elicited by the Dix-Hallpike maneuver.
本文报告了一名33岁男性左侧3.5厘米前庭神经鞘瘤患者的眼震电图、听觉脑干反应及磁共振成像结果。特别值得关注的是，在右侧垂头位进行Dix-Hallpike手法检查后出现了异常的定位性眼震。该患者表现出一种起病迅速且重复定位后不疲劳的眼震。在定位过程中，患者有垂直摆动感和烦躁不安，但无旋转性眩晕。最重要的是，眼震以向下跳动的垂直成分为主。该病例说明了Dix-Hallpike手法诱发的向下跳动性眼震的诊断意义。
