Analysis of Vestibulo-Ocular Reflex Using Sweep Frequency Active Head Movements

O'Leary, Dennis P.; Davis, Linda Lindsey; Kitsigianis, Geli-Ann

doi:10.1159/000416053

Cited by 19 publications

(25 citation statements)

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“…74,78 The test-retest reliability of active horizontal head rotation at higher frequencies was poor in one study, 67 a finding at odds with a previous report. 79 There have been inconsistencies in vertical VOR measurements as well. Overall, normative data obtained in high-frequency, self-generated head movements are not well established.…”

Section: Active Head Rotational Testing (Ahr) (Patient-generated Rotmentioning

confidence: 99%

Assessment: Vestibular testing techniques in adults and children [RETIRED]

Fife¹,

Tusa²,

Furman³

et al. 2000

Neurology

221

110

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Overview. Neurologists are frequently called upon to evaluate patients with vertigo and dizziness and, in some cases, to make sense of abnormal vestibular tests. Consequently, it is useful to have some familiarity with the methods used to test vestibular function.The vestibulo-ocular reflex (VOR) is a reflex that acts at short latency to generate eye movements that compensate for head rotations in order to preserve clear vision during locomotion. The VOR is the most accessible gauge of vestibular function. Evaluating the VOR requires application of a vestibular stimulus and measurement of the resulting eye movements.This report reviews the advantages and limitations of the methods of stimulating the vestibular system: caloric irrigation, rotational chair testing, and auto-rotational testing. Vestibular testing in children is given additional consideration because of the paucity of recent reviews on the topic. This report will not address eye movement recording techniques, the neurophysiology of the VOR, which is reviewed elsewhere, 1,2 or interpretation of nystagmus.Literature review. This evidence-based assessment was developed from a review of published articles obtained through the MEDLINE database of the National Library of Medicine. Relevant publications were rated by the strength of evidence according to a scheme approved by the Therapeutics and Technology Assessment Subcommittee of the American Academy of Neurology (see Appendix 2).

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Section: Active Head Rotational Testing (Ahr) (Patient-generated Rotmentioning

confidence: 99%

Assessment: Vestibular testing techniques in adults and children [RETIRED]

Fife¹,

Tusa²,

Furman³

et al. 2000

Neurology

221

110

View full text Add to dashboard Cite

show abstract

“…10 Several methods of testing the peripheral vestibular system have been developed that enable testing of the vestibular ocular reflex over a frequency range more similar to those frequencies of head movements produced during functional tasks. [11][12][13][14][15][16][17][18][19][20][21][22][23] One such test is the Vestibular Autorotation Test (VAT) (Western Systems Research Inc., Pasadena, CA). 16,22 The VAT was developed in the early 1980s in an effort to provide a cost-effective solution to assess vestibular function over the broad range of head movement frequencies that occur during functional activities.…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14][15][16][17][18][19][20][21][22][23] One such test is the Vestibular Autorotation Test (VAT) (Western Systems Research Inc., Pasadena, CA). 16,22 The VAT was developed in the early 1980s in an effort to provide a cost-effective solution to assess vestibular function over the broad range of head movement frequencies that occur during functional activities. During the VAT, the subject performs active horizontal or vertical head movements over an increasing frequency range from 0.5 to 5.9 Hz for 18 seconds while visually fixating a one square centimeter target placed six feet away.…”

Section: Introductionmentioning

confidence: 99%

“…Although sweep frequency testing using active head movements is not a novel concept, being first performed by Atkin and Bender 11 in the early 1960s, Western Systems Research Inc. were the first to introduce a portable, computer-based, and commercially available system. 16,22 The manufacturer recommends the number of trials that a subject perform be repeated until "a sufficient number of tests results in 3 tests which demonstrate repeatability through relatively small standard deviation SD. "…”

Section: Introductionmentioning

confidence: 99%

“…16,22,24 -31 However, varying levels of reliability have been reported in samples from normal populations. [26][27][28]31 The purposes of this study were to establish the intrarater and interrater reliability of the VAT in a clinical sample of individuals reporting dizziness and to determine what factors may affect reliability.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Reliability of the Vestibular Autorotation Test (VAT) in Patients with Dizziness

Blatt

Schubert

Roach

et al. 2008

Journal of Neurologic Physical Therapy

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Objective-To establish intrarater and interrater reliability of the Vestibular Autorotation Test (VAT) (Western Systems Research Inc., Pasadena, CA) in a clinical sample of individuals reporting dizziness.Study Design-Ninety-eight patients with reports of dizziness referred for vestibular function testing performed repeated trials of horizontal VAT. A subsample of 49 individuals repeated the test for a second rater.Results-Approximately 66% of subjects were unable to meet the performance criterion of six consecutive trials where data was displayed at frequencies ≥3. Conclusions-Many patients had difficulty performing the VAT. The reliability estimates for phase and asymmetry, but not gain, were significantly affected by practice. Careful attention to patient preparation, instruction, and test monitoring including sufficient patient practice before data collection are likely to be critical factors to ensure quality data.

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1996

Whiplash Injuries

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Analysis of Vestibulo-Ocular Reflex Using Sweep Frequency Active Head Movements

Cited by 19 publications

References 0 publications

Assessment: Vestibular testing techniques in adults and children [RETIRED]

Assessment: Vestibular testing techniques in adults and children [RETIRED]

The Reliability of the Vestibular Autorotation Test (VAT) in Patients with Dizziness

Whiplash Effects on the Vestibulo-oculomotor System

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