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Intraoperative Cochlear Implant Reinsertion Effects Evaluated by Electrode Impedance.

Fearghal M Toner1, Halit Sanli1, Andrew C Hall2

  • 1The Sydney Cochlear Implant Centre, Gladesville, NSW.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|June 23, 2020
PubMed
Summary
This summary is machine-generated.

Intraoperative reinsertion of cochlear implant (CI) arrays did not increase impedance levels compared to controls. This suggests reinsertion does not cause additional trauma, impacting surgical practices and future intracochlear therapy delivery designs.

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Area of Science:

  • Otolaryngology
  • Biomedical Engineering
  • Neurosurgery

Background:

  • Cochlear implantation (CI) is a vital treatment for severe hearing loss.
  • Intraoperative array reinsertion is sometimes necessary but its effect on device performance is not well understood.

Purpose of the Study:

  • To evaluate the impact of intraoperative cochlear implant array reinsertion on electrode impedance levels.
  • To compare impedance measurements in reinsertion cases with matched controls.

Main Methods:

  • Retrospective review of CI recipients requiring intraoperative array reinsertion.
  • Impedance values were analyzed at multiple postoperative time points (intraoperative, switch-on, 3, 6, 12 months).
  • Generalized Estimating Equation (GEE) model used for statistical comparison between reinsertion cases and controls.

Main Results:

  • Thirty-one reinsertion cases were analyzed across different CI array models (CI 422, CI 24RE (ST), CI 512).
  • No significant increase in impedance levels was observed in reinsertion cases compared to matched controls.
  • A statistically significant finding of lower impedances was noted in the CI 422 cohort at switch-on for reinsertion cases (p=0.03).

Conclusions:

  • Intraoperative cochlear implant array reinsertion does not lead to increased impedance levels.
  • These findings suggest that reinsertion does not cause significant additional trauma or inflammation.
  • The study has implications for managing faulty electrodes and designing future intracochlear delivery systems.