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Vestibular function in patients with cochlear implantation.

D Vibert1, R Häusler, M Kompis

  • 1Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital, University of Berne, Berne, Switzerland. dominique.vibert@insel.ch

Acta Oto-Laryngologica. Supplementum
|October 27, 2001
PubMed
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Cochlear implantation (CI) generally preserves vestibular function, though temporary canal disturbances occur in 20% of patients. Otolithic function remains intact post-CI, indicating minimal long-term impact on balance systems.

Area of Science:

  • Otolaryngology
  • Neuroscience
  • Audiology

Background:

  • Cochlear implantation (CI) is a common treatment for severe to profound hearing loss.
  • The impact of CI on vestibular function, crucial for balance, requires thorough investigation.

Purpose of the Study:

  • To assess the influence of cochlear implantation on both vestibular canal and otolithic function.
  • To evaluate pre- and postoperative vestibular status in patients undergoing CI.

Main Methods:

  • Electronystagmography (ENG) with caloric and rotatory testing was performed pre- and post-CI.
  • Off-vertical axis rotation (OVAR) was used to measure otolithic function post-CI.
  • Vestibular examinations were conducted at varying intervals after surgery.

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Main Results:

  • Preoperative vestibular function was often preserved, except in cases of meningitis-related deafness.
  • Immediately post-CI, transient vertigo and nystagmus occurred in some patients with normal preoperative function.
  • Postoperative canal function was preserved in 62% of patients with initially normal function; otolithic function was preserved in all tested patients.

Conclusions:

  • Cochlear implantation does not typically abolish vestibular function, especially in non-meningitis deafness etiologies.
  • Temporary disturbances in canal function affect approximately 20% of CI patients.
  • Otolithic function is consistently preserved after cochlear implantation.