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Hearing Preservation Outcomes Using a Precurved Electrode Array Inserted With an External Sheath.

Ashley M Nassiri1, Robert J Yawn1, Jourdan T Holder2

  • 1Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University Medical Center.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|November 21, 2019
PubMed
Summary
This summary is machine-generated.

Hearing preservation cochlear implantation (CI) using a precurved electrode array shows good speech performance and minimal hearing loss. Deeper electrode insertion correlates with better speech understanding, though individual cochlear anatomy is a factor.

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Audiology

Background:

  • Hearing preservation cochlear implantation (CI) aims to maintain residual hearing.
  • Precurved electrode arrays inserted via an external sheath are utilized in CI surgery.
  • Understanding electrode positioning's impact on hearing outcomes is crucial.

Purpose of the Study:

  • To assess audiologic outcomes in hearing preservation CI using a precurved electrode array.
  • To evaluate the association between electrode positioning and residual hearing preservation.

Main Methods:

  • Retrospective review of 24 adult patients undergoing hearing preservation CI.
  • Utilized precurved electrode arrays with an external sheath.
  • Audiologic measures (CNC, AzBio, LFPTA) and intraoperative CT for electrode location were assessed.

Main Results:

  • A small threshold shift (17.3 dB) was observed post-CI activation.
  • Consonant-nucleus-consonant (CNC) word scores significantly improved from 6% to 64%.
  • Deeper angular insertion depth correlated with improved 6-month CNC scores.

Conclusions:

  • Precurved electrode arrays with an external sheath achieve hearing preservation comparable to straight arrays.
  • Angular insertion depth is a positive predictor of speech performance in scala tympani insertions.
  • Individual cochlear anatomy may influence the relationship between insertion depth and outcomes.