Purely torsional spontaneous nystagmus almost always has a central vestibular cause. We describe a man with spontaneous pulse-synchronous torsional nystagmus in which the clockwise component corresponded to his pulse upswing, in keeping with a peripheral vestibular cause; following imaging we diagnosed left-sided superior canal dehiscence syndrome. Identifying pulse synchronicity of spontaneous nystagmus may help to distinguish central from peripheral vestibular torsional nystagmus, and is readily confirmed at the bedside using Frenzel’s glasses and a pulse oximeter.

中文翻译：

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脉冲同步扭转性眼球震颤

纯粹的扭转性自发性眼球震颤几乎总是由中央前庭引起。我们描述了一个具有自发性脉冲同步扭转性眼球震颤的男性，其中顺时针分量对应于他的脉冲上升，与外周前庭原因一致；影像学检查后，我们诊断出左侧上管裂开综合征。识别自发性眼球震颤的脉冲同步性可能有助于区分中枢性和外周性前庭扭转性眼球震颤，并且在床边使用 Frenzel 眼镜和脉搏血氧仪很容易确认。