J Korean Neurol Assoc.
2007 Aug;25(3):426-429.
Transient Upbeat Nystagmus Due to Unilateral Pontine Infarction
- Affiliations
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- 1Department of Neurology, College of Medicine, Hanyang University, Guri, Korea. ksh213@hanyang.ac.kr
Abstract
- 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 vestibulo- ocular 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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