Transient Upbeat Nystagmus Due to Unilateral Pontine Infarction

J Korean Neurol Assoc > Volume 25(3); 2007 > Article

Journal of the Korean Neurological Association 2007;25(3): 426-429.

일측 뇌교경색에 의한 일과성 상방눈떨림

이승철, 이하늘 장우영 고성호 이규용 이영주

한양대학교 의과대학 신경과학교실

Transient Upbeat Nystagmus Due to Unilateral Pontine Infarction

Seung-Chul Lee

Department of Neurology, College of Medicine, Hanyang University, Guri, Korea

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.KeyWords:Upbeat nystagmus, Unilateral pontine infarction