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Related Experiment Videos

Early mucosal changes in experimental sinusitis.

M L Hinni1, T V McCaffrey, J L Kasperbauer

  • 1Department of Otorhinolaryngology, Mayo Graduate School of Medicine, Rochester, MN.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|October 1, 1992
PubMed
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Acute sinusitis involves early damage to sinus lining cells and impaired mucociliary flow. Pathogenic bacteria significantly reduce ciliated cells, disrupting this crucial defense mechanism.

Area of Science:

  • Otolaryngology
  • Microbiology
  • Cell Biology

Background:

  • Normal mucociliary flow is a vital defense against acute sinusitis.
  • Early changes in sinus mucosa and mucociliary function during infection are not well understood.

Purpose of the Study:

  • To investigate early sinus mucosal and mucociliary changes following acute infection.
  • To determine the impact of specific bacterial pathogens on ciliary beat frequency and ciliated cell loss.

Main Methods:

  • Twenty rabbits underwent inoculation of an obstructed maxillary sinus with Streptococcus pneumoniae, Hemophilus influenzae, Pseudomonas aeruginosa, or sterile saline.
  • Measurements included sinus mucosal ciliary beat frequency, ciliated cell loss quantitation, and electron microscopy over 5 days.

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Main Results:

  • Infected rabbits showed significant changes in ciliary beat frequency (p < 0.05), either excitatory or inhibitory, depending on the pathogen and infection duration.
  • Control animals exhibited no changes in ciliary beat frequency (p > 0.55) or ciliated cell loss.
  • All infected groups experienced a >86% decrease in viable ciliated cells after 5 days of sinusitis.

Conclusions:

  • Significant ciliated cell loss and disrupted mucociliary flow occur early after exposure to pathogenic organisms.
  • These early changes are a significant predisposing factor in the development of acute sinusitis.