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Related Experiment Videos

Hyperventilation and vertigo

L A Monday, L Tétreault

    The Laryngoscope
    |June 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Hyperventilation did not significantly alter post-caloric nystagmus but increased the occurrence of nystagmus in different positions, suggesting a link to cerebral hypoxia.

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    Area of Science:

    • Neurology
    • Vestibular System
    • Physiology

    Background:

    • Dizziness is a common subjective sensation.
    • Hyperventilation can provoke dizziness.
    • The objective physiological correlates of hyperventilation-induced dizziness are not fully understood.

    Purpose of the Study:

    • To objectively assess the effect of hyperventilation on nystagmus.
    • To determine if hyperventilation-induced dizziness correlates with objective nystagmus changes.

    Main Methods:

    • Electronystagmography (ENG) was performed on 19 healthy subjects.
    • Subjects underwent a routine ENG followed by a test with 90-second hyperventilation periods.
    • Post-caloric nystagmus and nystagmus in various positions were analyzed.

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    Main Results:

    • Hyperventilation did not significantly affect the slow-phase velocity of post-caloric nystagmus.
    • Hyperventilation significantly increased the number of positions in which nystagmus was elicited (p = 0.061).

    Conclusions:

    • Hyperventilation may induce dizziness through mechanisms involving cerebral hypoxia.
    • Cerebral vasoconstriction and the Bohr effect are potential contributors to hyperventilation-induced cerebral hypoxia.
    • ENG can objectively detect changes related to hyperventilation, although not consistently on post-caloric nystagmus slow phase.