title: Rebound upbeat nystagmus after lateral gaze in episodic ataxia type 2.
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.
authors.affiliation: Biomedical Research Institute, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Hyo-Jung
authors.initials: HJ
authors.lastname: Kim
authors.forename: Ji-Soo
authors.initials: JS
authors.lastname: Kim
authors.forename: Jae-Hwan
authors.initials: JH
authors.lastname: Choi
authors.forename: Jin-Hong
authors.initials: JH
authors.lastname: Shin
authors.forename: Kwang-Dong
authors.initials: KD
authors.lastname: Choi
authors.forename: David S
authors.initials: DS
authors.lastname: Zee
mesh_terms: D000293:Adolescent; D000328:Adult; D001259:Ataxia / Q000175:diagnosis / Q000503:physiopathology; D002648:Child; D005133:Eye Movements / Q000502:physiology*; D005260:Female; D005403:Fixation, Ocular / Q000502:physiology*; D006801:Humans; D008297:Male; D009154:Mutation / Q000235:genetics; D009759:Nystagmus, Pathologic / Q000175:diagnosis / Q000235:genetics / Q000503:physiopathology*; D010375:Pedigree