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KMID : 0359720070250030426
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Journal of the Korean Neurological Association
2007 Volume.25 No. 3 p.426 ~ p.429
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Transient Upbeat Nystagmus Due to Unilateral Pontine Infarction
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Lee Seung-Chul
Lee Ha-Neul
Jang Woo-Young
Koh Seong-Ho
Lee Kyu-Yong
Lee Yong-Joo
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Abstract
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Upbeat nystagmus has been described in bilateral lesions of the medulla, the ventral tegmentum, the anterior
cerebellar vermis, the adjacent brachium conjunctivum, and the midbrain. Imbalance of the vertical vestibuloocular
reflex (VOR) favoring the downward VOR activity would therefore result in upbeat nystagmus. We report
a patient with transient upbeat nystagmus due to unilateral pontine infarction that may have disrupted bilateral
upward VOR pathways running in the ventral tegmental tracts.
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KEYWORD
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Upbeat nystagmus, Unilateral pontine infarction
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