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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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Related Experiment Video

Updated: Dec 20, 2025

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
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Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

Published on: August 4, 2023

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Immune Response After Cochlear Implantation.

Edi Simoni1,2,3, Erica Gentilin1,2, Mariarita Candito1,2

  • 1Bioacoustics Research Laboratory, Department of Neurosciences, University of Padua, Padua, Italy.

Frontiers in Neurology
|June 2, 2020
PubMed
Summary
This summary is machine-generated.

Dexamethasone-eluting electrodes protect the cochlea from cochlear implant trauma by reducing inflammation and tissue growth. This long-term study in guinea pigs supports dexamethasone as an additive for improved hearing outcomes.

Keywords:
cochleostomydexamethasonedrug deliveryfibrosisneuronal degenerationsteroids

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Performing Intracochlear Electrocochleography During Cochlear Implantation
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Performing Intracochlear Electrocochleography During Cochlear Implantation

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Area of Science:

  • Otoaryngology
  • Biomaterials Science
  • Neuroscience

Background:

  • Cochlear implants (CIs) restore hearing but can cause cochlear trauma and inflammation, impacting effectiveness.
  • Preserving residual hearing is crucial for optimizing CI outcomes.
  • Medicated devices, like dexamethasone-eluting electrodes, are being developed to minimize CI-induced injury.

Purpose of the Study:

  • To evaluate the long-term effects of dexamethasone-eluting electrodes on cochlear trauma preservation in a guinea pig model.
  • To assess the anti-inflammatory and tissue-modulating properties of dexamethasone in the context of CI surgery.

Main Methods:

  • Bilateral implantation of dexamethasone-eluting or non-eluting rods in guinea pigs.
  • Auditory brainstem response audiometry to assess hearing thresholds up to 60 days post-implantation.
  • Histological examination of cochlear tissue, including bone/fibrous tissue growth, cochleostomy healing, and neuronal density.
  • Analysis of inflammatory markers (TNF-α, IL-6) and foreign body giant cells.

Main Results:

  • Long-term electrode implantation did not induce ongoing inflammation, as indicated by inflammatory markers and cell presence.
  • Dexamethasone release significantly reduced bone and fibrous connective tissue growth within the scala tympani.
  • Cochleostomy healing showed less bone tissue growth in dexamethasone-treated animals.
  • Dexamethasone did not negatively impact spiral ganglion cell density.

Conclusions:

  • Dexamethasone-eluting electrodes effectively mitigate cochlear trauma associated with cochlear implantation.
  • Dexamethasone demonstrates long-term anti-inflammatory and tissue-protective effects in the cochlea.
  • Results support the use of dexamethasone as an additive for eluting electrodes to enhance CI efficacy and preserve hearing.