Test-retest reliability of the VOR as measured via Vorteq in healthy subjects.
To determine the reliability of the vestibolo-ocular reflex test measured via Vorteq, 16 subjects underwent head-autorotation test at the frequencies 1-5 Hz. All patients underwent the re-test. No linear correlation was observed between the measurements, i.e., no repeatability of the same measurements at the various frequencies. The Head Auto-Rotation Test by Vorteq has demonstrated advantages: patients are not disturbed by the active head movements; the full test protocol, lasts only a few minutes; the method enables the vestibolo-ocular reflex to be evaluated at high head-rotation frequencies. However, the test has disadvantages: poor test-retest inter-individual repeatability, wide standard deviations of results with heterogeneous inter-individual spread with regard to phase and asymmetry values especially at high rotation frequencies. In the light of the above findings, it can be seen that the test-retest of the Vorteq system is not sufficiently reliable and hence cannot be used in clinical practice.
Department of Otorhinolaryngology, Head and Neck Surgery, University of Trieste, Cattinara Hospital, Trieste, Italy. tirellig@units.it
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Tirelli
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Bigarini
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Russolo
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Giacomarra
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Sasso
D000328:Adult; D003627:Data Interpretation, Statistical; D004584:Electronystagmography; D005260:Female; D019416:Head Movements; D006801:Humans; D008297:Male; D008875:Middle Aged; D012027:Reflex, Vestibulo-Ocular / Q000502:physiology*; D012399:Rotation; D013997:Time Factors; D014717:Vertigo / Q000175:diagnosis*; D014724:Vestibular Function Tests