AI Article Synopsis
- The study investigates subjective visual vertical (SVV) perception in patients with acute unilateral vestibulopathy (AUVP) and benign paroxysmal positional vertigo (BPPV), focusing on how they align a bar with gravity in darkness.
- The results indicate that patients with AUVP show greater SVV errors when aligning lines toward the affected side, especially at a 30° angle, suggesting asymmetry in their perception.
- The study emphasizes the need for individualized SVV assessments in clinical practice to improve diagnosis and understanding of otolith organ imbalances that can lead to chronic dizziness.
Article Abstract
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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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11273183 | PMC |
| http://dx.doi.org/10.7874/jao.2023.00346 | DOI Listing |
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Article Synopsis
- The study investigates subjective visual vertical (SVV) perception in patients with acute unilateral vestibulopathy (AUVP) and benign paroxysmal positional vertigo (BPPV), focusing on how they align a bar with gravity in darkness.
- The results indicate that patients with AUVP show greater SVV errors when aligning lines toward the affected side, especially at a 30° angle, suggesting asymmetry in their perception.
- The study emphasizes the need for individualized SVV assessments in clinical practice to improve diagnosis and understanding of otolith organ imbalances that can lead to chronic dizziness.
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