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Electrode migration after cochlear implantation.

Christian von Mitzlaff1,2, Adrian Dalbert1,2, Sebastian Winklhofer2,3

  • 1Department of Otorhinolaryngology, University Hospital Zurich, Zurich, Switzerland.

Cochlear Implants International
|November 5, 2020
PubMed
Summary
This summary is machine-generated.

Changes in cochlear implant (CI) electrode impedance, particularly in basal electrodes, can indicate electrode migration. Straight CI electrodes show a higher migration rate than precurved ones.

Keywords:
Cochlear implantsElectrode migrationImpedance

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Area of Science:

  • Otolaryngology
  • Biomedical Engineering
  • Neurosurgery

Background:

  • Cochlear implants (CIs) are crucial for hearing restoration.
  • Electrode array integrity is vital for CI efficacy.
  • Electrode migration can compromise CI performance.

Purpose of the Study:

  • To analyze impedance changes in Cochlear™ CI electrodes (straight vs. precurved).
  • To determine if basal electrode impedance changes predict cochlear electrode migration.

Main Methods:

  • Retrospective case series of 560 patients (2010-2018).
  • Assessed intraoperative and follow-up electrode impedance.
  • Used CT scans to confirm electrode migration in cases of basal impedance change.

Main Results:

  • Basal electrode impedance changes occurred in 2.1% of cases.
  • CT scans confirmed electrode array migration in 6 of 9 assessed patients.
  • Straight electrodes had a significantly higher migration rate (4.1%) than precurved (0%).

Conclusions:

  • Electrode impedance monitoring is valuable for assessing CI integrity and detecting potential migration.
  • Straight Cochlear™ electrode arrays may benefit from lead wire fixation to reduce migration risk.