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KMID : 1036520130030010052
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Clinical Neuro-Ophthalmology
2013 Volume.3 No. 1 p.52 ~ p.54
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Static Tilt Suppression of Upbeat Nystagmus in Medullar Lesion
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Woo Seong-Min
Lee Hyung
Kim Hyun-Ah
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Abstract
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An impairment of “antigravitational” pathway, possibly the crossing ventral tegmental tract (CVTT) and its collateral branch, nucleus of Roller and/or a cell group of the paramedian tracts is suggested as a cause of upbeat nystagmus in brainstem lesions. We report a case of upbeat nystagmus accompanying a lesion of the caudal dorsomedial medulla. The upbeat nystagmus was completely suppressed by head hanging position. We postulate that upbeat nystagmus due to damage of collateral branch of CVTT can be abolished in the head hanging position. In which, the effect of gravity is reversed for vertical eye movements similar with in upside down head position.
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KEYWORD
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Otolith, Vertical nystagmus
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