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Case Reports
. 2014 Jun;13(3):411-3.
doi: 10.1007/s12311-014-0547-6.

Rebound upbeat nystagmus after lateral gaze in episodic ataxia type 2

Hyo-Jung Kim  1 , Ji-Soo Kim, Jae-Hwan Choi, Jin-Hong Shin, Kwang-Dong Choi, David S Zee
Affiliations
Case Reports

Rebound upbeat nystagmus after lateral gaze in episodic ataxia type 2

Hyo-Jung Kim et al. Cerebellum. 2014 Jun.

Abstract

Rebound nystagmus is a transient nystagmus that occurs on resuming the straight-ahead position after prolonged eccentric gaze. Even though rebound nystagmus is commonly associated with gaze-evoked nystagmus (GEN), development of rebound nystagmus in a different plane of gaze has not been described. We report a patient with episodic ataxia type 2 who showed transient upbeat nystagmus on resuming the straight-ahead position after sustained lateral gaze that had induced GEN and downbeat nystagmus. The rebound upbeat nystagmus may be ascribed to a shifting null in the vertical plane as a result of an adaptation to the downbeat nystagmus that developed during lateral gaze.

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