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- Visual Fixation-Induced Hemi-Seesaw Nystagmus
- Hyun Sung Kim, Eun Hye Oh, Jae-Hwan Choi
- Res Vestib Sci. 2023;22(1):19-22. Published online March 13, 2023
- DOI: https://doi.org/10.21790/rvs.2023.22.1.19
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Abstract
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Supplementary Material - Seesaw nystagmus (SSN) is characterized by conjugate torsional nystagmus with opposite vertical components in the two eyes. The waveform may be pendular or jerk (hemi-seesaw nystagmus, HSSN), in which the slow phase corresponds to one half-cycle and the quick phase to the other. Pendular SSN and HSSN have distinct clinical presentations and underlying causes. The pathophysiology of pendular SSN may be instability of visuovestibular interactions, while the underlying mechanism for HSSN may be related to the ocular tilt reaction or an imbalance in vestibular pathways. We report a patient with HSSN due to unilateral mesodiencephalic infarction that becomes apparent during visual fixation only.
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- Midbrain lesion-induced disconjugate gaze: a unifying circuit mechanism of ocular alignment?
Maximilian U. Friedrich, Laurin Schappe, Sashank Prasad, Helen Friedrich, Michael D. Fox, Andreas Zwergal, David S. Zee, Klaus Faßbender, Klaus-Ulrich Dillmann
Journal of Neurology.2024;[Epub] CrossRef
- Midbrain lesion-induced disconjugate gaze: a unifying circuit mechanism of ocular alignment?
- Positional Hemiseesaw Nystagmus in Ataxia with Oculomotor Apraxia Type 2 due to a Novel Senataxin Gene Mutation: A New Phenotype
- Sung-Hee Kim, Ja-Hyun Jang, Ji-Soo Kim
- Res Vestib Sci. 2020;19(1):12-15. Published online March 15, 2020
- DOI: https://doi.org/10.21790/rvs.2020.19.1.12
- 4,597 View
- 48 Download
- 1 Crossref
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Abstract
PDFSupplementary Material
- Ataxia with ocular motor apraxia type 2 (AOA2) is an autosomal recessive disorder that is characterized by adolescent-onset gait ataxia, peripheral neuropathy, ocular apraxia, and cerebellar atrophy. A 19-year-old male with AOA2 from a novel SETX mutation showed distinct oculomotor abnormalities that included spontaneous and gaze-induced downbeat nystagmus, impaired smooth pursuit, and reversed catch-up saccades during horizontal head impulse tests, as well as peripheral neuropathy involving the lower extremities and mild slowing of frontal processing. He also showed positional hemiseesaw nystagmus in the supine and straight head-hanging positions. Positional hemiseesaw nystagmus is a new manifestation of hereditary cerebellar ataxia and may be explained by a gravity-dependent position-induced error in estimating the tilt in the roll plane due to dysfunction of the tilt-estimator circuit.
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Citations
Citations to this article as recorded by- A Case of AOA2 With Compound Heterozygous SETX Mutations
Hee Jin Chang, Ryul Kim, Minchae Kim, Jangsup Moon, Man Jin Kim, Han-Joon Kim
Journal of Movement Disorders.2022; 15(2): 178. CrossRef
- A Case of AOA2 With Compound Heterozygous SETX Mutations
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