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Electrode array design determines scalar position, dislocation rate and angle and postoperative speech perception.

Manuel Christoph Ketterer1, Antje Aschendorff2, Susan Arndt2

  • 1Department of Otorhinolaryngology-Head and Neck Surgery, Faculty of Medicine, Medical Center-University of Freiburg, University of Freiburg, Killianstrasse 5, 79106, Freiburg, Germany. manuel.christoph.ketterer@uniklinik-freiburg.de.

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
|November 15, 2021
PubMed
Summary
This summary is machine-generated.

Electrode array design significantly impacts cochlear implant placement and dislocation angles. While dislocation itself doesn't affect speech perception, deeper insertion angles negatively impact outcomes.

Keywords:
Cochlear morphologyCoverageElectrode array designScalar positionSpeech perception

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Biomedical Engineering

Background:

  • Cochlear implant electrode array insertion is crucial for hearing restoration.
  • Understanding electrode array behavior within the cochlea is essential for optimizing surgical outcomes.
  • Variations in electrode array design may influence intra-cochlear placement and subsequent speech perception.

Purpose of the Study:

  • To investigate scalar dislocation rates of straight and perimodiolar electrode arrays.
  • To analyze electrode array dislocation points based on design and shape.
  • To correlate electrode array position and dislocation with postoperative speech perception.

Main Methods:

  • Comparative analysis of 495 cochlear implant patient ears (2013-2018).
  • Utilized cone beam computed tomography (CBCT) to assess electrode array position (scalar insertion, dislocation, depth).
  • Compared postoperative speech discrimination based on array dislocation, insertion, and depth.

Main Results:

  • The 'CA' array showed the highest rate of primary scala vestibuli (SV) insertions.
  • The 'Flex®Soft' array exhibited the highest rate of dislocations out of the scala tympani (ST).
  • No significant difference in dislocation rates was observed for cochleostomy-inserted arrays; dislocation angle varied by design. Deeper angular insertion depth significantly reduced speech perception.

Conclusions:

  • Electrode array design significantly influences scalar location, dislocation rate, and angle.
  • Straight and perimodiolar arrays demonstrate distinct dislocation patterns.
  • Cochleostomy insertion does not increase dislocation rates; however, angular insertion depth negatively impacts speech perception.