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Performing Intracochlear Electrocochleography During Cochlear Implantation
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Electrode migration after cochlear implant surgery: more common than expected?

Aarno Dietz1, Minna Wennström2, Antti Lehtimäki3

  • 1Department of Otorhinolaryngology, Kuopio University Hospital, PO Box 100, 70029, Kuopio, Finland. aarno.dietz@kuh.fi.

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
|July 13, 2015
PubMed
Summary

Electrode migration, a cause of cochlear implant issues like increased impedance, may be more common than thought. Post-surgery imaging is crucial for detecting this complication.

Keywords:
Cochlear implantsCone-beam computed tomographyElectrode migrationImpedances

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Biomedical Engineering

Background:

  • Cochlear implant surgery has a low complication rate.
  • Electrode failures, including migration, are a small but significant cause of complications.

Purpose of the Study:

  • To investigate the prevalence of electrode migration.
  • To identify migration as a cause of increased impedance and non-auditory stimulation in basal cochlear implant channels.

Main Methods:

  • Reviewed cochlear implant database from Kuopio University Hospital.
  • Re-examined patients with elevated impedance or non-auditory stimulation.
  • Utilized cone-beam computed tomography (CBCT) for imaging.

Main Results:

  • 18 patients (18 devices) showed signs of electrode issues.
  • CBCT revealed extra-cochlear electrodes in 12 patients due to migration.
  • Migrated electrodes were all straight, lateral wall arrays (Cochlear CI422, Med-El).

Conclusions:

  • Electrode migration may be more frequent than previously reported.
  • Gradual impedance increase in basal electrodes is a key indicator.
  • Emphasizes careful electrode fixation during surgery and the importance of postoperative imaging.