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Patterns Seen During Electrode Insertion Using Intracochlear Electrocochleography Obtained Directly Through a

Michael S Harris1, William J Riggs, Christopher K Giardina

  • 1*Department of Otolaryngology-Head and Neck Surgery and Nationwide Children's Hospital, The Ohio State University Wexner Medical Center, Columbus, Ohio †Department of Otolaryngology-Head and Neck Surgery, University of North Carolina, Chapel Hill, North Carolina ‡Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University Medical Center, Nashville, Tennessee §Advanced Bionics Corporation, Valencia, California.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|September 28, 2017
PubMed
Summary
This summary is machine-generated.

Intraoperative electrocochleography (ECochG) during cochlear implant (CI) insertion reveals distinct patterns. Monitoring these ECochG patterns may help preserve hearing during CI surgery.

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Area of Science:

  • Otoacoustic Emissions
  • Neuroscience
  • Biomedical Engineering

Background:

  • Conventional cochlear implant (CI) surgery lacks real-time monitoring of cochlear neural and hair cell responses.
  • Intracochlear electrocochleography (ECochG) via the CI electrode offers a potential feedback mechanism.
  • Understanding insertion-related ECochG patterns is crucial for intraoperative decision-making and hearing preservation prognostication.

Purpose of the Study:

  • To characterize distinct patterns of intracochlear electrocochleography (ECochG) during cochlear implant (CI) electrode insertion.
  • To explore the potential of ECochG as an intraoperative monitoring tool for hearing preservation.

Main Methods:

  • Intracochlear ECochG was recorded in 17 patients during CI electrode insertion.
  • A 50-ms, 500 Hz, 110 dB SPL tone burst stimulus was used.
  • The first harmonic amplitude of the ECochG response from the apical electrode was monitored in real-time.

Main Results:

  • Three distinct patterns of first harmonic amplitude change were identified during insertion.
  • Type A (52%): Amplitude increased throughout insertion.
  • Type B (11%): Amplitude decreased throughout insertion.
  • Type C (35%): Amplitude peaked mid-insertion.

Conclusions:

  • Three characteristic ECochG patterns were observed during cochlear electrode insertion.
  • Further research will correlate these patterns with cochlear trauma and hearing outcomes.
  • Intracochlear ECochG shows promise for intraoperative guidance in CI surgery.