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Temporal Bone Histopathology of First-Generation Cochlear Implant Electrode Translocation.

Akira Ishiyama1, Gail Ishiyama2, Ivan A Lopez1

  • 1Department of Head and Neck Surgery.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|May 7, 2019
PubMed
Summary

Cochlear implant (CI) translocation injuries, often occurring at 180 degrees, are linked to lateral wall damage, fewer spiral ganglia neurons (SGNs), and poorer hearing outcomes. Longer electrode insertion increases translocation risk and intracochlear injury.

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Histopathology

Background:

  • Understanding cochlear implant (CI) translocation injuries is crucial for improving patient outcomes.
  • Histopathological analysis of human temporal bones (HTBs) provides insights into CI-related trauma.

Purpose of the Study:

  • To evaluate the histopathology of human temporal bones (HTBs) with cochlear implants (CI).
  • To correlate CI translocation injuries with histopathological findings and auditory performance.

Main Methods:

  • Histopathological examination of 13 HTBs from 12 CI patients.
  • Classification of injuries into localized (Group 1) and significant lateral wall (Group 2) based on translocation severity.
  • Analysis of surgical approach, CI insertion angle and length, spiral ganglia neuron (SGN) counts, and auditory performance.

Main Results:

  • Translocation injuries occurred near 180 degrees insertion angle.
  • Group 2 (significant lateral wall injury) had longer CI insertions (21.86 mm vs 18.50 mm), fewer SGNs (6714 vs 17300), and poorer auditory performance (39.86% vs 66.55%) compared to Group 1.
  • Group 2 exhibited significant osteoneogenesis and cellular infiltration at injury sites, particularly with cochleostomy approach.

Conclusions:

  • CI translocation injuries, especially with cochleostomy and longer electrodes, are associated with lateral wall damage, reduced SGNs, and diminished auditory outcomes.
  • Histopathological findings highlight the detrimental effects of intracochlear injury on neural structures and hearing function.