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논문 기본 정보

자료유형
학술저널
저자정보
Haijoub Souad (Physiotherapist (Independent Researcher), Paris, France) Lacour Michel (Aix-Marseille University, Marseille; Neurosciences Department, Centre National de la Recherche Scientifique, Paris, France)
저널정보
대한청각학회 Journal of Audiology & Otology Journal of Audiology & Otology Vol.28 No.3
발행연도
2024.7
수록면
213 - 220 (8page)
DOI
10.7874/jao.2023.00346

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Background and Objectives: Perception of verticality is clinically assessed using the subjective visual vertical (SVV), a test of the otolith system that consists of aligning a bar on the gravitational vertical in darkness. Patients with acute unilateral vestibulopathy (AUVP) show a systematic SVV bias toward the affected side, whichever the side of line orientation. Whether SVV estimates are symmetrical has not been investigated.Subjects and Methods: This study included 10 patients with AUVP (vestibular neuritis) and 10 with BPPV (posterior semicircular canal). SVV measurements were made at two preset angles of line orientation (15° and 30°) toward the ipsilateral and contralateral sides, relative to the affected side.Results: The results showed asymmetrical SVV estimates in the AUVP group, with significantly greater SVV errors for ipsilateral than contralateral line orientation, as well as for the preset angle of 30° compared to 15°. SVV estimates were significantly lower in patients with BPPV who also exhibited SVV asymmetry. SVV estimates remained unchanged just after the maneuver and were normalized some days later or after supplementary maneuvers.Conclusions: SVV asymmetry should be routinely considered in the clinic. We recommend individually assessing ipsilateral and contralateral SVV and using at least two preset angles. This allows for a better assessment and diagnosis of otolith organ imbalance that can trigger chronic instability and dizziness. The contribution of neck afferents related to head position in space seems to be the main source of SVV asymmetry.

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