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Cochlear perfusion with a viscous fluid.

Yi Wang1, Elizabeth S Olson2

  • 1Department of Biomedical Engineering, Columbia University, New York, NY 10025, USA.

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|May 26, 2016
PubMed
Summary
This summary is machine-generated.

Cochlear perfusion with viscous fluids, like sodium hyaluronate (HA), can impact hearing function. Studies show higher HA concentrations damage the cochlea, with significant hearing loss above 1.5 Pa shear stress.

Keywords:
Cochlear implantationCochlear mechanicsCochlear perfusionCompound action potentialSodium hyaluronateViscous fluid

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Area of Science:

  • Otoacoustic emissions
  • Biophysics
  • Fluid dynamics

Background:

  • Viscous fluid flow in the cochlea generates shear forces with potential clinical applications.
  • Understanding cochlear fluid mechanics is crucial for advancing treatments like cochlear implants.
  • Perfusion with viscous fluids may pose risks of cochlear damage.

Purpose of the Study:

  • To investigate the physiological and anatomical effects of perfusing gerbil cochleae with viscous sodium hyaluronate (HA) solutions.
  • To determine the threshold of shear stress the cochlea can tolerate without significant functional impairment.
  • To assess the impact of varying HA concentrations on cochlear function and structure.

Main Methods:

  • Gerbil cochleae were perfused with artificial perilymph (AP) and HA at concentrations from 0.0625% to 0.5% at 2.4 μL/min.
  • Perfusion occurred sequentially or individually, entering from the round window and exiting the basal scala vestibuli.
  • Compound action potentials (CAP) were measured, and cochlear histology was analyzed post-perfusion.

Main Results:

  • CAP thresholds increased with higher HA concentrations, indicating hearing function impairment.
  • Reissner's membrane remained intact with 0.0625% HA but was torn at 0.125% and 0.25% HA.
  • Significant CAP threshold elevation occurred above 1.5 Pa shear stress, likely due to Reissner's membrane rupture.

Conclusions:

  • The gerbil cochlea can withstand shear stress up to 1.5 Pa without significant CAP threshold shift.
  • Higher HA concentrations (≥0.125%) cause Reissner's membrane damage and elevate CAP thresholds.
  • Temporary CAP shifts and a novel P0 peak in CAP waveforms were observed, suggesting complex cochlear responses to viscous fluid perfusion.