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Vestibular function in patients with a large vestibular aqueduct

T Okumura1, H Takahashi, I Honjo

  • 1Department of Otolaryngology, Kobe City General Hospital, Japan.

Acta Oto-Laryngologica. Supplementum
|January 1, 1995
PubMed
Summary

Patients with large vestibular aqueduct (VA) commonly experience vertigo. Vestibular function is impaired in large VA cases, potentially due to pressure changes affecting the inner ear.

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Vestibular System

Background:

  • Enlarged vestibular aqueduct (EVA) is a common inner ear malformation.
  • EVA is associated with hearing loss, but its effect on vestibular function is less understood.

Purpose of the Study:

  • To investigate vestibular function in patients with large vestibular aqueduct (VA).
  • To explore the relationship between VA size and vertigo symptoms.

Main Methods:

  • Evaluated 4 patients (7 ears) with large VA for vertigo history and vestibular function.
  • Performed caloric testing and observed positional nystagmus.
  • Compared vestibular responses in large VA ears to control subjects.

Main Results:

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  • All 4 patients reported vertigo.
  • Caloric responses were significantly reduced in large VA ears compared to controls.
  • One patient exhibited fluctuating caloric responses and direction-changing apogeotropic positional nystagmus after various triggers.

    • Conclusions:

    • Large vestibular aqueduct (VA) is associated with general impairment of both hearing and vestibular function.
    • Intracranial pressure changes transmitted to the inner ear may influence cochlear and vestibular function via the enlarged endolymphatic sac and duct.