Evaluation of the vestibulo-ocular reflex using sinusoidal off-vertical axis rotation in patients with canal paresis

Abstract Objective The vestibulo-ocular reflex (VOR) was studied to determine the utility of off-vertical axis rotation (OVAR) in evaluating vestibular function in patients with canal paresis (CP). Our goal was to determine whether there is any correlation between caloric responses and sinusoidal ro...

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Bibliographic Details
Published in:Auris, nasus, larynx nasus, larynx, 2014-02, Vol.41 (1), p.22-26
Main Authors: Sugita-Kitajima, Akemi, Koizuka, Izumi
Format: Article
Language:English
Subjects:
Adolescent
Adult
Aged
Caloric Tests
Canal paresis
Case-Control Studies
Female
Human
Humans
Male
Middle Aged
Off-vertical axis rotation
Otolaryngology
Otolith
Otolithic Membrane - physiopathology
Paresis - physiopathology
Peripheral vestibular lesions
Reflex, Vestibulo-Ocular - physiology
Rotation
Semicircular Canals - physiopathology
Vestibular Diseases - diagnosis
Vestibular Diseases - physiopathology
Vestibulo-ocular reflex
Young Adult
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Summary:Abstract Objective The vestibulo-ocular reflex (VOR) was studied to determine the utility of off-vertical axis rotation (OVAR) in evaluating vestibular function in patients with canal paresis (CP). Our goal was to determine whether there is any correlation between caloric responses and sinusoidal rotatory responses. Methods Subjects were rotated in a sinusoidal pattern with eyes open in complete darkness. Frequencies of 0.4 and 0.8 Hz with a maximum angular velocity of 60°/s at either earth-vertical axis rotation (EVAR) or OVAR were used. Results Twenty-three control subjects and 21 patients with CP were investigated. Results showed that (1) the VOR gain difference between EVAR and OVAR in the CP patients was not significant at 0.4 Hz and at 0.8 Hz; (2) the gain during 0.4 Hz EVAR was less in the bilateral CP patients compared to controls; and (3) the VOR gain of the affected side at 0.8 Hz was significantly less during OVAR than during EVAR. Conclusion We concluded that the absence or reduction of caloric responses does not indicate the absence of vestibular function. In addition, separation analysis of the VOR gain of affected and intact sides is useful for evaluating laterality of otolith function in patients with CP.
ISSN:0385-8146
1879-1476
DOI:10.1016/j.anl.2013.04.014