Detection of isolated covert saccades with the video head impulse test in peripheral vestibular disorders
| Autor: | Alexander Blödow, Sebastian Pannasch, Leif Erik Walther |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Adult
Male medicine.medical_specialty genetic structures Video Recording Audiology Young Adult Vertigo Saccades otorhinolaryngologic diseases medicine Humans Head Impulse Test Vestibular Neuronitis Meniere Disease Aged Vestibular system Semicircular canal biology business.industry Head impulse test Neuroma Acoustic Reflex Vestibulo-Ocular General Medicine Middle Aged medicine.disease biology.organism_classification Bilateral vestibulopathy Semicircular Canals Peripheral medicine.anatomical_structure Vestibular Diseases Otorhinolaryngology Case-Control Studies Reflex Female Surgery sense organs business Meniere's disease |
| Zdroj: | Auris Nasus Larynx. 40:348-351 |
| ISSN: | 0385-8146 |
| DOI: | 10.1016/j.anl.2012.11.002 |
| Popis: | The function of the semicircular canal receptors and the pathway of the vestibulo-ocular-reflex (VOR) can be diagnosed with the clinical head impulse test (cHIT). Recently, the video head impulse test (vHIT) has been introduced but so far there is little clinical experience with the vHIT in patients with peripheral vestibular disorders. The aim of the study was to investigate the horizontal VOR (hVOR) by means of vHIT in peripheral vestibular disorders.Using the vHIT, we examined the hVOR in a group of 117 patients and a control group of 20 healthy subjects. The group of patients included vestibular neuritis (VN) (n=52), vestibular schwannoma (VS) (n=31), Ménière's disease (MD) (n=22) and bilateral vestibulopathy (BV) (n=12).Normal hVOR gain was at 0.96 ± 0.08, while abnormal hVOR gain was at 0.44 ± 0.20 (79.1% of all cases). An abnormal vHIT was found in VN (94.2%), VS (61.3%), MD (54.5%) and BV (91.7%). Three conditions of refixation saccades occurred frequently in cases with abnormal hVOR: isolated covert saccades (13.7%), isolated overt saccades (34.3%) and the combination of overt and covert saccades (52.0%).The vHIT detects abnormal hVOR changes in the combination of gain assessment and refixation saccades. Since isolated covert saccades in hVOR changes can only be seen with vHIT, peripheral vestibular disorders are likely to be diagnosed incorrectly with the cHIT to a certain amount. |
| Databáze: | OpenAIRE |
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