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Response Changes During Insertion of a Cochlear Implant Using Extracochlear Electrocochleography.

Christopher K Giardina1,2, Tatyana E Khan1, Stephen H Pulver1

  • 1Department of Otolaryngology/Head and Neck Surgery, University of North Carolina at Chapel Hill, North Carolina, USA.

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Summary

Extracochlear electrocochleography during cochlear implantation (CI) effectively monitors cochlear function, identifying atraumatic insertions and physiological changes. This method offers a feasible alternative to intracochlear recordings for intraoperative assessment.

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Electrocochleography (ECoG) is used intraoperatively to monitor cochlear function during cochlear implantation (CI).
  • Intracochlear ECoG recordings using the CI electrode have limitations due to electrode movement relative to neural generators.
  • External recording sites are needed for stable intraoperative monitoring of cochlear function.

Purpose of the Study:

  • To compare the signal strength and feasibility of two extracochlear recording sites for intraoperative ECoG monitoring during CI.
  • To characterize cochlear physiological changes during CI insertion using extracochlear ECoG.

Main Methods:

  • Electrocochleography (ECoG) responses to tone bursts were recorded from 83 human subjects at the round window (RW) and extracochlear sites (stapes or promontory).
  • Extracochlear recordings were continued during CI insertion in 63 cases to assess intraoperative changes.
  • Signal strength and response stability were analyzed for both RW and extracochlear sites.

Main Results:

  • Before CI insertion, RW recordings showed slightly higher amplitude than extracochlear sites; extracochlear sites did not differ from each other.
  • During CI insertion, 61% of cases showed response changes within 5 dB from extracochlear sites, suggesting atraumatic insertion.
  • Some insertions resulted in temporary or persistent response drops, with early drops (<15 mm) showing higher recovery rates.

Conclusions:

  • Extracochlear ECoG provides a feasible method for intraoperative monitoring during CI.
  • This technique can identify potentially atraumatic insertions and detect cochlear interactions or persistent response losses.
  • Observed response changes and recovery patterns offer insights into cochlear physiology during CI insertion.