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KMID : 1036520150050010047
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Clinical Neuro-Ophthalmology
2015 Volume.5 No. 1 p.47 ~ p.50
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Upbeat Nystagmus During Head Rotation in Rotational Vertebral Artery Occlusion
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Park Seung-Ha
Kim Seong-Jang
Seo Jae-Deuk
Kim Dae-Hyun
Choi Jae-Hwan
Choi Kwang-Dong
Kim Ji-Soo
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Abstract
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Rotational vertebral artery occlusion (RVAO) is characterized by recurrent attacks of paroxysmal vertigo, nystagmus, tinnitus, and syncope induced by horizontal head rotation. The induced nystagmus in RVAO was mostly mixed downbeat and horizontal with or without a torsional component. We report upbeat nystagmus induced by head rotation in a patient with RVAO. The upbeat nystagmus in our patient can be explained by asymmetrical inhibition of bilateral anterior semicircular canals due to ischemia or by transient excitation of the inferior cerebellum due to hypoperfusion. Alternatively, transient ischemia of the brainstem may be invoked to explain the vertigo and nystagmus.
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KEYWORD
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Rotational vertebral artery occlusion, Upbeat nystagmus, Vertebrobasilar ischemia
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