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Reference values for serial vestibular testing.

L Proctor, R Glackin, H Shimizu

    The Annals of Otology, Rhinology, and Laryngology
    |January 1, 1986
    PubMed
    Summary
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    This study establishes normal day-to-day variations in vestibular function using caloric tests. Results provide reference ranges for test-retest variability in caloric responses for clinical use.

    Area of Science:

    • Neurology
    • Otolaryngology
    • Vestibular System Physiology

    Background:

    • Vestibular function assessment is crucial for diagnosing balance disorders.
    • Understanding normal day-to-day variability is essential for accurate interpretation of test results.

    Purpose of the Study:

    • To define the normal limits of day-to-day variation in vestibular function.
    • To establish normative data for caloric test responses in healthy individuals.

    Main Methods:

    • A short-acting caloric test was administered to 30 normal subjects over three consecutive days.
    • Nystagmus intensity was quantified using an interactive computerized technique.
    • Test-retest reliability was further assessed in a subset of ten subjects over additional sessions.

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    Main Results:

    • Individual caloric test scores typically ranged from 55% to 170% of the initial value.
    • Averaged scores demonstrated narrower ranges of variation.
    • Upper normal limits for test-retest variation were 24% for right-left difference and 22% for directional preponderance.
    • Minimal habituation of caloric responses was observed.

    Conclusions:

    • Day-to-day variations in vestibular function are quantifiable and exhibit predictable ranges.
    • The established limits for test-retest variability aid in distinguishing true pathological changes from normal fluctuations.
    • These findings provide valuable normative data for the clinical assessment of vestibular disorders.