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Related Experiment Videos

Vertical nystagmus in routine caloric testing.

H O Barber, S Stoyanoff

    Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
    |December 1, 1986
    PubMed
    Summary
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    Vertical nystagmus during caloric testing is common, appearing in 29% of normal individuals and 12% of dizziness patients. This finding, often with hot stimuli, does not automatically indicate central nervous system disease.

    Area of Science:

    • Neurology
    • Ophthalmology
    • Vestibular System

    Background:

    • Caloric testing typically assesses horizontal nystagmus.
    • Vertical nystagmus is an unexpected finding during this test.

    Purpose of the Study:

    • To investigate the occurrence and characteristics of vertical nystagmus during caloric testing.
    • To determine if vertical nystagmus indicates central nervous system pathology.

    Main Methods:

    • Evaluated 112 normal subjects and 339 patients with dizziness undergoing caloric testing.
    • Recorded and analyzed horizontal and vertical nystagmus, including slow component velocity (SCV) and time profiles.

    Main Results:

    • Vertical nystagmus occurred in 29% of normals and 12% of patients.

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  • It was more frequent with hot than cool stimuli and always accompanied by horizontal nystagmus.
  • Vertical nystagmus SCV was typically half or less than horizontal nystagmus SCV; SCV time profiles differed.

    • Conclusions:

    • Vertical nystagmus in caloric testing is a relatively common finding.
    • Its presence does not automatically signify central nervous system disease.
    • Further investigation into the origins of vertical nystagmus is warranted.