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Determining optimal cochlear implant electrode array with OTOPLAN.

Hidekane Yoshimura1, Kizuki Watanabe1, Shin-Ya Nishio2

  • 1Department of Otorhinolaryngology - Head and Neck Surgery, Shinshu University School of Medicine, Matsumoto, Japan.

Acta Oto-Laryngologica
|September 22, 2023
PubMed
Summary

Accurate cochlear duct length (CDL) measurement using OTOPLAN software preoperatively helps select the correct cochlear implant (CI) array length. This ensures optimal speech performance for CI patients.

Keywords:
Cochlear implantangular insertion depthcochlear duct lengthdeafnesshearing loss

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Biomedical Engineering

Background:

  • Optimizing speech performance after cochlear implantation (CI) requires precise measurement of cochlear duct length (CDL).
  • Determining the appropriate length of the CI electrode array is crucial for successful implantation.

Purpose of the Study:

  • To investigate cochlear duct length (CDL) in CI patients using OTOPLAN software.
  • To compare OTOPLAN's preoperative angular insertion depth (AID) estimation with postoperative radiography results.

Main Methods:

  • The study included 105 Japanese CI patients with normal cochleae.
  • CDL was measured using OTOPLAN, and AID was estimated preoperatively.
  • Postoperative radiography was used to determine actual AID.

Main Results:

  • The mean CDL was 35.1 ± 1.6 mm.
  • Preoperative OTOPLAN AID estimation showed a strong linear correlation (R = 0.635) with postoperative radiography results (580.3° vs. 583.0°).

Conclusions:

  • CDL exhibits significant individual variation.
  • Preoperative CDL measurement with OTOPLAN is clinically feasible and accurate for selecting appropriate CI electrode array lengths.
  • Accurate array selection based on individual CDL can enhance speech perception outcomes in CI patients.