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.
Tirelli
G
G
Department of Otorhinolaryngology, Head and Neck Surgery, University of Trieste, Cattinara Hospital, Trieste, Italy. tirellig@units.it
Bigarini
S
S
Russolo
M
M
Giacomarra
V
V
Sasso
F
F
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