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Association between lateral wall electrode array insertion parameters and audiological outcomes in bilateral cochlear

Vivian Thimsen1, Konstantinos Mantsopoulos2, Tim Liebscher2

  • 1Department of Otorhinolaryngology, Head and Neck Surgery, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Waldstrasse 1, 91054, Erlangen, Germany. vivian.thimsen@uk-erlangen.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 27, 2022
PubMed
Summary

For cochlear implant (CI) patients, the duration of deafness significantly impacts speech recognition, more so than electrode placement. Postlingually deafened individuals demonstrate superior speech perception compared to perilingual ones.

Keywords:
Angular insertion depthCochlear duct lengthCochlear implantFrequency-to-place mismatchLateral wall electrodeSpeech recognition

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Area of Science:

  • Audiology
  • Neurosurgery
  • Speech-Language Pathology

Background:

  • Bilateral cochlear implantation (CI) is a common treatment for profound hearing loss.
  • Understanding factors influencing speech recognition outcomes is crucial for patient management.
  • Previous research suggests electrode insertion parameters may affect hearing outcomes.

Purpose of the Study:

  • To compare speech recognition at various postoperative times in bilaterally implanted patients.
  • To evaluate the impact of deafness duration, frequency-to-place mismatch, and electrode insertion depth/separation on audiometric results.

Main Methods:

  • Retrospective analysis of 19 adult patients with sequential bilateral CI using lateral wall electrode arrays.
  • Statistical analysis included t-tests, Wilcoxon test, median test, and Spearman's correlation.
  • Comparison of speech perception (WRS65[CI]) and cochlear duct length between postlingual and perilingual deafness groups.

Main Results:

  • Postlingually deafened patients exhibited significantly better speech perception than perilingual patients (p < 0.001).
  • Perilingual patients had slightly smaller cochlear duct lengths (p = 0.045).
  • No significant association was found between frequency-to-place mismatch, angular separation, and speech perception; intraindividual differences in electrode position did not impact outcomes.

Conclusions:

  • The duration of deafness and preoperative speech recognition are more influential on speech comprehension in CI patients than precise electrode positioning.
  • Electrode insertion parameters like AID and angular separation appear to have minimal impact on speech understanding.