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Related Experiment Videos

Air caloric stimulation with tympanic membrane perforation

H O Barber, W M Harmand, K E Money

    The Laryngoscope
    |July 1, 1978
    PubMed
    Summary

    Dry air caloric stimulation causes unusual nystagmus in ears with perforations. This "inversion" is due to middle ear mucus cooling, not central nervous system issues.

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    Area of Science:

    • Vestibular system physiology
    • Otolaryngology

    Background:

    • Caloric stimulation typically elicits ipsilateral nystagmus.
    • Contralateral or inverted nystagmus is observed with tympanic membrane perforations or middle ear cavities.

    Purpose of the Study:

    • To investigate the mechanism of inverted caloric nystagmus in ears with perforations.
    • To differentiate central nervous system causes from peripheral vestibular system alterations.

    Main Methods:

    • Caloric stimulation using warm and cold air was performed on squirrel monkeys and human patients.
    • Observed nystagmus responses, including direction and conjugacy.
    • Correlated findings with the status of the tympanic membrane and middle ear cavity.

    Main Results:

    • Warm air caloric stimulation in ears with tympanic membrane perforation or mastoidectomy frequently caused contralateral nystagmus.
    • Evidence suggests endolymph cooling via evaporative cooling of middle ear mucus by dry air is the primary cause.
    • A patient with eardrum perforation showed disconjugate horizontal nystagmus after cold air stimulation, likely due to vertical semicircular canal stimulation.

    Conclusions:

    • Inverted or disconjugate caloric nystagmus in air stimulation is primarily linked to tympanic membrane perforations or external ear moisture.
    • Central nervous system disease is a less frequent cause of these nystagmus patterns.

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