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Cochlear Implant Electrode Array Design and Speech Understanding.

Varun Vohra1, Nicholas S Andresen2, Courtney Carver2

  • 1Johns Hopkins University School of Medicine.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|December 28, 2023
PubMed
Summary
This summary is machine-generated.

Perimodiolar (PM) electrode arrays in cochlear implants show slightly better speech perception than lateral wall (LW) arrays. This finding is consistent across manufacturers and long-term follow-up, aiding surgical and patient choices.

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Area of Science:

  • Audiology
  • Neurosurgery
  • Biomedical Engineering

Background:

  • Cochlear implant electrode arrays are designed as either lateral wall (LW) or perimodiolar (PM) types.
  • The choice of electrode array design may influence postoperative speech perception outcomes.

Purpose of the Study:

  • To compare the long-term effects of perimodiolar (PM) versus lateral wall (LW) cochlear implant electrode arrays on speech perception.
  • To investigate outcomes across multiple manufacturers and extended follow-up periods.

Main Methods:

  • Retrospective cohort study of 478 adult cochlear implant recipients (1992-2017).
  • Analysis of postoperative speech perception using Consonant-Nucleus-Consonant Word (CNC-w) and Hearing in Noise Test (HINT) scores.
  • Evaluation of outcomes between 6 months and 5 years post-implantation.

Main Results:

  • Perimodiolar arrays were implanted in 63.2% of patients, while lateral wall arrays were used in 36.8%.
  • Patients with PM arrays demonstrated significantly higher CNC-w scores at 6 months to 2 years (p=0.036) and 2 to 5 years (p<0.001).
  • Multivariable analysis revealed greater improvement in CNC-w and HINT scores for the PM group compared to the LW group post-implantation.

Conclusions:

  • Perimodiolar electrode arrays are associated with modest improvements in postoperative speech perception compared to lateral wall arrays.
  • These findings support the use of PM arrays for potentially enhanced speech understanding.
  • Results can inform surgeon selection and patient counseling regarding cochlear implant array choice.