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Published in: Neurological Sciences 7/2022

04-03-2022 | Spontaneous Nystagmus | Original Article

Effect of convergence on the horizontal VOR in normal subjects and patients with peripheral and central vestibulopathy

Authors: Ammar L. Ujjainwala, Callum D. Dewar, Laurel Fifield, Caroline Rayburn, Emily Buenting, Jordan Boyle, Jorge C. Kattah

Published in: Neurological Sciences | Issue 7/2022

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Abstract

Background

Vestibular compensatory eye movements provide visual fixation stabilization during head movement. The anatomic pathways mediating a normal horizontal vestibulo-ocular reflex (h-VOR), when lesioned, cause spontaneous nystagmus. While previous reports address the effect of convergence on different spontaneous nystagmus types, to our knowledge, a study of acute vestibular nystagmus suppression viewing near targets comparing patients with peripheral or central vestibular lesions has not been previously reported.

Methods

We attempt to clarify potential vestibular and near-reflex interaction by comparing near and far h-VOR gain in 19 healthy controls, six patients with acute/subacute peripheral vestibular lesion (PVL), and one patient with unilateral vestibular nuclear lesion (VNL) in the pontine tegmentum.

Results

The horizontal (h)-VOR in normal subjects increased with convergence in both eyes (P = 0.027, P < 0.001). In unilateral PVL patients, gain failed to increase in either direction (P = 0.25, P = 0.47). In contrast, when fixating at 15 cm, the h-aVOR in the VNL lesion, gain did not increase, and a right h-nystagmus developed. Even though we found inability to increase gain in PVL with near target fixation, this did not interfere with h-nystagmus suppression upon converging. Our VNL patient had normal h-nystagmus suppression viewing far distance targets and lacked near target h-nystagmus suppression.

Conclusion

We hypothesize that normal IO/flocculus pathway suppressed spontaneous nystagmus in PVL. Impaired h-VOR near adaptation in the medial vestibular nucleus was responsible for h-nystagmus direction with fixation block. Additionally, impaired viewing distance estimate contributed to near h-nystagmus suppression failure.
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Metadata
Title
Effect of convergence on the horizontal VOR in normal subjects and patients with peripheral and central vestibulopathy
Authors
Ammar L. Ujjainwala
Callum D. Dewar
Laurel Fifield
Caroline Rayburn
Emily Buenting
Jordan Boyle
Jorge C. Kattah
Publication date
04-03-2022
Publisher
Springer International Publishing
Published in
Neurological Sciences / Issue 7/2022
Print ISSN: 1590-1874
Electronic ISSN: 1590-3478
DOI
https://doi.org/10.1007/s10072-022-05970-8

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