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Cochlear implantation improves hearing in the contralateral ear

O Ribári1, I Sziklai

  • 1ORL Clinic, Semmelweis Medical University, Budapest, Hungary.

Acta Oto-Laryngologica
|March 1, 1995
PubMed
Summary

Cochlear implants (CI) significantly improved hearing in the opposite ear for deaf patients. Combining CI with hearing aids maximized speech understanding, suggesting extracochlear (EC) implants may be a better initial choice.

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Electrical stimulation via cochlear implants (CI) can impact hearing in the non-implanted ear.
  • Understanding the effects of different CI types and speech processors on contralateral hearing is crucial.

Purpose of the Study:

  • To evaluate the effect of cochlear implantation on contralateral hearing.
  • To determine the optimal CI strategy for maximizing speech discrimination.

Main Methods:

  • Seven patients received either intracochlear (IC) or extracochlear (EC) cochlear implants.
  • Speech discrimination scores were measured with and without contralateral hearing aids.
  • Contralateral hearing improvement was assessed in terms of sound pressure level (SPL) and frequency.

Main Results:

  • Cochlear implantation improved contralateral hearing by 10-15 dB SPL up to 4000 Hz.
  • Best speech discrimination (98% + 2%) was achieved with CI combined with contralateral hearing aids.
  • Hearing recovery in the previously deaf ear occurred 4-6 months post-implantation.
  • Extracochlear (EC) implantation did not preclude successful second intracochlear (IC) implantation.

Conclusions:

  • Extracochlear (EC) implantation may be a preferred first choice in childhood.
  • EC implantation preserves the inner ear's sensory epithelium, potentially allowing for more physiological hearing post-stimulation.
  • This approach maintains options for future IC implantation without compromising success rates.

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