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Title: Video Head Impulse Test (vHIT): Value of Gain and Refixation Saccades in Unilateral Vestibular Neuritis
Authors: Psillas, George K. 
Petrou, Ioanna 
Printza, Athanasia 
Sfakianaki, Ioanna 
Binos, Paris 
Anastasiadou, Sofia 
Constantinidis, Jiannis 
Major Field of Science: Medical and Health Sciences
Field Category: Health Sciences
Keywords: Video head impulse test;Saccades;Vestibular gain;Vestibular neuritis;Vestibuloocular reflex;Semicircular canal
Issue Date: 16-Jun-2022
Source: Journal of Clinical Medicine, 2022, vol. 11, no. 12, articl. no. 3467
Volume: 11
Issue: 12
Journal: Journal of Clinical Medicine 
Abstract: The aim of this study was to evaluate gain and refixation saccades (covert and overt) using a video head impulse test (vHIT) in the horizontal and vertical planes in patients after the onset of unilateral acute vestibular neuritis (AVN). Thirty-five patients were examined in the acute stage of AVN and at follow-up (range, 6–30 months); a control group of 32 healthy subjects also participated. At onset, the mean gain was significantly lower on the affected side in all of the semi-circular canal planes, mainly in the horizontal canal plane, and saccades (covert and overt) were more prevalent in the horizontal compared to the vertical canal planes. Multi-canal affection occurred more frequently (80% for gain, 71% for saccades) than isolated canal affection. At follow-up, which ranged from 6 to 30 months, the gain was recovered in all of the canals (anterior in 50%, horizontal in 42.8%, and posterior canal in 41.1% of cases), while covert and overt saccades were reduced in the horizontal and vertical planes. However, covert saccades were still recorded in a greater proportion (69%) than overt saccades (57%) in the horizontal plane and at a lower rate in the vertical planes. The compensatory mechanisms after AVN mainly involve the horizontal canal, as the refixation saccades—especially covert ones—were more frequently recorded in the horizontal than vertical canals.
ISSN: 2077-0383
DOI: 10.3390/jcm11123467
Rights: This is an open access article distributed under the Creative Commons Attribution License
Type: Article
Affiliation : Aristotle University of Thessaloniki 
Cyprus University of Technology 
Appears in Collections:Άρθρα/Articles

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