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Binaural cochlear implants placed during the same operation.

Bruce J Gantz1, Richard S Tyler, Jay T Rubinstein

  • 1Department of Otolaryngology-Head and Neck Surgery, University of Iowa College of Medicine, University of Iowa Hospitals and Clinics, Iowa City, Iowa 52242-1078, USA.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|March 5, 2002
PubMed
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Binaural cochlear implants improve sound localization for all users and may enhance speech understanding in quiet and noisy environments for some individuals. Pre-implantation assessments did not predict outcomes.

Area of Science:

  • Audiology
  • Neurosurgery
  • Speech-Language Pathology

Background:

  • Bilateral cochlear implantation (CI) offers potential benefits for hearing but requires careful evaluation.
  • Understanding binaural advantages and predictive factors is crucial for optimizing CI outcomes.

Purpose of the Study:

  • To assess binaural listening benefits for speech perception in quiet and noise with independently programmed bilateral CIs.
  • To evaluate sound localization abilities with bilateral CIs.
  • To determine if pre-implantation factors predict CI performance.

Main Methods:

  • Prospective study involving bilateral CI implantation in a single surgical procedure.
  • Speech and sound localization testing with individual and combined CIs.
  • Analysis of pre- and intraoperative psychophysical and physiological measures.

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Main Results:

  • Bilateral CI surgery was safe, with no major postoperative complications.
  • A binaural advantage for speech in quiet was observed in 20% of subjects.
  • Two implants benefited 20% of subjects in speech-in-noise tests.
  • All subjects showed improved sound localization with bilateral CIs.
  • Head shadow effect benefited all subjects when signal-to-noise ratio differed between ears.
  • Pre-implantation measures did not predict speech perception outcomes.

Conclusions:

  • Bilateral CIs significantly improve sound localization.
  • Bilateral CIs have the potential to enhance speech understanding in quiet and noise for some individuals.
  • Pre-implantation assessments are not reliable predictors of post-implantation speech performance.