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Related Experiment Videos

Bacterial tympanogenic labyrinthitis, meningitis, and sensorineural damage.

P A Schachern1, M M Paparella, R Hybertson

  • 1University of Minnesota Otitis Media Research Center, Minneapolis.

Archives of Otolaryngology--Head & Neck Surgery
|January 1, 1992
PubMed
Summary

Streptococcus pneumoniae can invade the inner ear through the round window membrane, causing neural damage and hearing loss in otitis media. Grafting the membrane prevented bacterial entry and subsequent labyrinthitis.

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Area of Science:

  • Otolaryngology
  • Microbiology
  • Pathology

Background:

  • Otitis media can lead to serious complications like sensorineural hearing loss, labyrinthitis, and meningitis.
  • The round window membrane is a known entry point for macromolecular substances into the inner ear, but its permeability to bacteria remains unclear.

Purpose of the Study:

  • To investigate the permeability of the round window membrane to Streptococcus pneumoniae.
  • To determine if bacterial entry through the round window membrane contributes to inner ear pathology following otitis media.

Main Methods:

  • Bilateral inoculation of Streptococcus pneumoniae type 7F into the middle ears of chinchillas.
  • Comparison between animals with and without grafted round window membranes.
  • Microscopic examination (light and electron) of inner ear structures.

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Main Results:

  • Bacteria successfully penetrated all layers of non-grafted round window membranes.
  • Inoculated bacteria reached all cochlear turns, entering neuronal pathways and causing nerve degeneration and hair cell damage.
  • Animals with continuous round window membrane grafts showed no signs of labyrinthitis or meningitis.

Conclusions:

  • The round window membrane is permeable to Streptococcus pneumoniae, providing a pathway for bacteria to reach the inner ear.
  • Bacterial invasion via the round window membrane can cause significant neural damage and hair cell loss, explaining hearing loss associated with otitis media.
  • Grafting the round window membrane effectively prevents bacterial translocation and subsequent inner ear inflammation.