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Updated: Sep 24, 2025

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Effect of Proximity to the Modiolus for the Cochlear CI532 Slim Modiolar Electrode Array on Evoked Compound Action

Ralf Greisiger1, Mariann Gjervik Heldahl1, Marte Myhrum2

  • 1Department of Otorhinolaryngology, Oslo University Hospital, Oslo, Norway.

Audiology & Neuro-Otology
|May 3, 2022
PubMed
Summary

The CI532 electrode array pullback maneuver resulted in lower intraoperative Evoked Compound Action Potential (ECAP) thresholds compared to initial insertion. However, no significant differences in ECAP or programming levels were found between pullback and standard insertion groups.

Keywords:
CI532Evoked Compound Action PotentialImagingObjective measuresProgramming levelsPullback

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Area of Science:

  • Otorhinolaryngology
  • Neurosurgery
  • Biomedical Engineering

Background:

  • The proximity of the CI532 electrode array to the modiolus impacts Evoked Compound Action Potentials (ECAPs).
  • Understanding electrode insertion techniques is crucial for optimizing cochlear implant outcomes.

Purpose of the Study:

  • To evaluate the effect of the CI532 electrode array "pullback" procedure on intraoperative ECAP responses.
  • To compare behavioral and ECAP thresholds between standard and pullback insertion methods.
  • To test the hypothesis that pullback insertion leads to lower ECAP and behavioral thresholds.

Main Methods:

  • The study involved 40 patients, divided into standard insertion (n=20) and pullback insertion (n=20) groups.
  • Intraoperative ECAP thresholds (T-ECAPs) were measured at different positions during insertion for the pullback group.
  • T-ECAPs and programming levels (C- and T-levels) were compared between groups and over time.

Main Results:

  • The pullback maneuver significantly reduced T-ECAPs compared to initial insertion positions within the pullback group.
  • No statistically significant differences in intraoperative T-ECAPs were observed between the final positions of the pullback and standard insertion groups.
  • Programming levels at 1 year post-implantation showed no significant difference between the two groups.

Conclusions:

  • While the pullback technique lowered intraoperative ECAP thresholds, it did not result in significant differences compared to standard insertion in the final analysis.
  • Larger patient cohorts may be necessary to detect subtle differences due to inter-subject variability in ECAP and programming levels.
  • The impact of the CI532 pullback technique on preserving residual hearing remains an area for future investigation.