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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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Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
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Relations Between Scalar Shift and Insertion Depth in Human Cochlear Implantation.

Freddi Zelener1, Omid Majdani1, Ariane Roemer1

  • 1Department of Otorhinolaryngology, Head and Neck Surgery.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|December 3, 2019
PubMed
Summary

Perimodiolar electrode arrays in cochlear implants are associated with a higher incidence of scalar shift compared to mid-scala electrode arrays. This finding is crucial for understanding electrode positioning and potential complications in cochlear implantation.

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Area of Science:

  • Otolaryngology
  • Biomedical Engineering
  • Neurosurgery

Background:

  • Electrode array position within the cochlea significantly impacts cochlear implantation outcomes.
  • Electrode array design can lead to trauma, including basilar membrane perforation or displacement into the scala vestibuli.

Purpose of the Study:

  • To investigate and compare the occurrence of scalar shift between two distinct electrode arrays: mid-scala and perimodiolar.
  • To analyze the relationship between electrode array type and intracochlear positioning after implantation.

Main Methods:

  • Retrospective analysis of cochlear implant recipients.
  • Comparison of scalar shift occurrence in patients receiving either a mid-scala (n=30) or a perimodiolar (n=30) electrode array.
  • Analysis of implantation data between 2010 and 2014 at a tertiary referral center.

Main Results:

  • Scalar shift was observed in 26.7% of patients with perimodiolar arrays versus 6.7% with mid-scala arrays.
  • Mean insertion depth for mid-scala arrays with scalar shift was significantly deeper (21.59 mm) than for perimodiolar arrays (17.85 mm).
  • A potential correlation between cochlear length and scalar shift occurrence was noted, though the mid-scala group with shift was small.

Conclusions:

  • Perimodiolar electrode arrays demonstrate a higher rate of scalar shift compared to mid-scala electrode arrays.
  • Electrode design plays a role in intracochlear positioning and potential complications.
  • Further research is warranted, especially concerning the mid-scala group with limited data.