Abstract
PurposeTime course of the recovery of otolithic dis-function caused by superior vestibular neuritis has been examined in fifteen patients.MethodsThe subjective visual vertical (SVV) and the ocular cyclotorsion (OT) have been measured four times after the acute episode up to 1 yearResultsIn most of the patients the SVV tilt returned to control values within few months (3–6 months) after the acute episode, while OT remained out of normal range in almost all patients a year later.ConclusionThe abnormal OT observed after 1 year from the acute episode of vestibular neuritis, suggests that the otolithic receptors remained altered for several months and the OT may be a good indicator of the entity of the residual peripheral otolithic lesion. Moreover, the dissociation between the SVV tilt recovery and that of OT supports the issue that the two signs of the otolithic disfunction are only partially linked each other with centrally or peripherally distinct re-balancing circuits.
Highlights
Ocular nystagmus, posture instability and vertigo are common symptoms after unilateral vestibular lesion [1,2,3]
This study investigated in VN patients the time course of the compensation of the subjective visual vertical (SVV) and ocular cyclotorsion (OT)
We found that both the amount of SVV tilt and of OT caused by unilateral vestibular damage gradually diminishes during the compensatory period but the time course of their attenuation is clearly dissociated
Summary
Posture instability and vertigo are common symptoms after unilateral vestibular lesion [1,2,3]. Thereafter, the vestibular static and dynamic symptoms gradually attenuated together with the improvement of the quality of life [4, 5]. This process is due to peripheral recovery of the afferent activity or vestibular compensation, due to central adaptation taking place in the central nervous system. Vestibular clinical examinations among these patients have been traditionally based on the assessment of the signs of semicircular canal disfunction.
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