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- W2078470569 abstract "Nystagmus after rapid head-shaking (post-headshake nystagmus) is often seen in patients with vestibulopathy. Post-headshake nystagmus is transient and is frequently associated with symptoms of dizziness, dysequilibrium, or vertigo. The phenomenon presumably reflects headshake-induced asymmetry in vestibulo-ocular reflex pathways, which persists after head-shaking stops. We postulated that the same vestibular imbalance that underlies post-headshake nystagmus might produce an equivalent in postural instability. To test this hypothesis, we investigated the effect of headshake on postural control and eye movements in patients who exhibited post-headshake nystagmus, vestibulopathy, or both. Postural instability was quantified with a dynamic platform device, whereas eye movements were recorded with electrooculography. Ten normal controls and 21 patients with a history of post-headshake nystagmus or unilateral vestibulopathy were evaluated. Subjects were tested for 20 seconds before and immediately after passive horizontal headshake (+/- 30-degree amplitude) at 2 Hz for 20 seconds. Postural stability was assessed while subjects stood with eyes closed, and the floor was modulated proportionally with sway. The difference in normalized peak-to-peak sway (equilibrium score) before and after headshake was assessed in all subjects and compared between groups. Post-headshake nystagmus was documented by electro-oculography recorded during posturography. Results for normal controls and vestibulopathic subjects without post-headshake nystagmus showed only a small transient decline in postural stability after headshake. Those with post-headshake nystagmus (regardless of caloric asymmetry) showed a robust decline in postural stability.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
- W2078470569 created "2016-06-24" @default.
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- W2078470569 date "1995-03-01" @default.
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- W2078470569 title "Nystagmus and postural instability after headshake in patients with vestibular dysfunction" @default.
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- W2078470569 doi "https://doi.org/10.1016/s0194-5998(95)70273-3" @default.
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