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Related Experiment Video

Updated: Mar 6, 2026

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation
03:49

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

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Insertion depth impacts speech perception and hearing preservation for lateral wall electrodes.

Brendan P O'Connell1, Jacob B Hunter1, David S Haynes1

  • 1Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University, Nashville, Tennessee, U.S.A.

The Laryngoscope
|March 18, 2017
PubMed
Summary

Deeper cochlear implant electrode insertion, measured by angular insertion depth (AID), correlates with improved speech perception outcomes in adults. However, increased insertion depth may negatively impact short-term hearing preservation.

Keywords:
Cochlear implantFlex 24Flex 28audiologic outcomeselectrode locationscalar translocationspeech perception

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Biomedical Engineering

Background:

  • Cochlear implantation is a complex procedure requiring precise electrode placement.
  • Understanding the relationship between electrode insertion depth and hearing outcomes is crucial for optimizing patient results.

Purpose of the Study:

  • To evaluate the angular insertion depths (AID) of Med-El electrodes.
  • To determine the correlation between AID and audiologic outcomes, including speech perception and hearing preservation.

Main Methods:

  • A retrospective review of postlingually deafened adults who received Med-El cochlear implants.
  • Analysis of pre- and post-operative CT scans to determine electrode location and AID.
  • Assessment of speech perception (CNC scores) and short-term hearing preservation.

Main Results:

  • All electrodes were successfully placed within the scala tympani.
  • A positive correlation was found between greater AID and improved CNC scores, particularly in patients without residual hearing.
  • Deeper insertions were associated with worse short-term hearing preservation.

Conclusions:

  • 100% of electrodes were inserted into the scala tympani, indicating successful surgical technique.
  • Greater angular insertion depth is linked to better speech perception outcomes in cochlear implant recipients.
  • While deeper insertion benefits speech perception, it may compromise short-term hearing preservation.