Abstract
The aim of this study was to evaluate the vestibulo-ocular reflex (VOR) gain and the saccade regrouping pattern PR score of the Video Head Impulse Test (vHIT) and its relationship with the slow-phase velocity (SPV) of skull vibration-induced nystagmus (SVIN) in recovery after a unilateral vestibular loss (UVL). A total of 36 patients suffering from vestibular neuritis (VN) were recruited and followed up for twelve months. In every visit, horizontal vHIT and an SVIN were performed, as well as VOR gain; PR score and the SPV of SVIN were measured. We observed a positive association between the VOR gain difference and the SPV of SVIN over time (probability greater than 0.86). Additionally, we obtained a positive association between the SPV of SVIN and the PR score in successive visits (odds ratio (OR) = −0.048; CI [0.898, 1.01]), with a probability of 0.95. Our results confirm that SPV of SVIN; VOR gain difference; and PR score decrease over time after a UVL. Both tests are useful in the follow-up of VN, as they could reflect its clinical compensation or partial recovery.
Highlights
The Video Head Impulse Test and skull vibration-induced nystagmus (SVIN) are two objective tests used to evaluate vestibular function in unilateral vestibular loss (UVL)
The Video Head Impulse Test (vHIT) evaluates the integrity of the vestibulo-ocular reflex (VOR) through two interesting measures: the gain and the saccade regrouping pattern (PR score)
One month after vestibular neuritis (VN), the mean VOR gain difference between both ears was 0.30 ± 0.22, the mean SVIN slow-phase velocity (SPV) in the affected ear was 13.12 ± 4.45 deg/s, and the mean PR score was 70.64 ± 26.75
Summary
The Video Head Impulse Test (vHIT) and skull vibration-induced nystagmus (SVIN) are two objective tests used to evaluate vestibular function in unilateral vestibular loss (UVL). The vHIT evaluates the integrity of the vestibulo-ocular reflex (VOR) through two interesting measures: the gain and the saccade regrouping pattern (PR score). The gain reflects the behavior of the VOR according to head movements. The PR score reflects the occurrence and disposition of corrective saccades when VOR gain is low. Patients with UVL have a reduced VOR gain (usually less than 0.8). Impulse tests of their affected ear cause, in these patients, the synchronous movement of their eyes with their head. They need to make corrective saccades, identifying the side of vestibular loss [1]
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