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Related Concept Videos

The Cochlea01:13

The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Updated: Jun 3, 2025

Performing Intracochlear Electrocochleography During Cochlear Implantation
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Improving Real-Time Feedback During Cochlear Implantation: The Auditory Nerve Neurophonic/Cochlear Microphonic Ratio.

Christofer Bester1,2, Stephen John O'Leary3,4, Frédéric Venail5

  • 1Ear Science Institute Australia, Perth, Australia.

Ear and Hearing
|January 10, 2025
PubMed
Summary

Monitoring the auditory nerve neurophonic (ANN)/cochlear microphonic (CM) ratio during cochlear implantation helps predict hearing loss. An increasing ANN/CM ratio indicates preserved hearing, while a decreasing ratio suggests significant hearing loss.

Keywords:
Cochlea healthCochlear implant diagnosticsCochlear implant electrophysiologyResidual hearing preservation

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Area of Science:

  • Otoacoustic emissions
  • Auditory neurophysiology
  • Cochlear implant technology

Background:

  • Cochlear implantation requires monitoring cochlear function to prevent hearing loss.
  • Cochlear microphonic (CM) monitoring can indicate hearing trauma, but is prone to false positives.
  • Auditory nerve neurophonic (ANN) monitoring may offer a more reliable indicator of cochlear function during implantation.

Purpose of the Study:

  • To test the hypothesis that the ANN/CM ratio increases during cochlear microphonic drops not associated with postoperative hearing loss.
  • To evaluate the utility of the ANN/CM ratio in differentiating true cochlear trauma from artifactual CM changes.
  • To assess the predictive value of the ANN/CM ratio for hearing preservation after cochlear implantation.

Main Methods:

  • Analyzed electrocochleography data from 28 adult cochlear implant recipients with pre-existing CM drops.
  • Measured cochlear microphonic (CM) and auditory nerve neurophonic (ANN) responses during and immediately after electrode insertion.
  • Calculated the ANN/CM ratio and correlated changes with postoperative pure-tone audiometry results at 4-6 weeks.

Main Results:

  • An increasing ANN/CM ratio during a CM drop was observed in 19 participants, while 9 showed a decrease.
  • Participants with a decreasing ANN/CM ratio experienced significantly worse median hearing loss (29.0 dB) compared to those with an increasing ratio (13.3 dB).
  • The ANN/CM ratio demonstrated better predictive accuracy for hearing preservation than ANN amplitude alone.

Conclusions:

  • The ANN/CM ratio effectively distinguishes between cochlear microphonic drops that result in hearing loss and those that do not.
  • This ratio is readily measurable and responds quickly during intraoperative monitoring.
  • The ANN/CM ratio shows promise for enhancing current and future intraoperative monitoring strategies in cochlear implantation.