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[Influence of otitis media with effusion on perilymph and round window membrane]
Abstract:
To investigate the influence of middle ear effusion (MEE) on perilymph (PL) and the round window membrane (RWM), an experimental otitis media with effusion (OME) was manufactured in chinchillas by injecting the tympanic cavity with immune complexes. The presence of MEE lasted 9 days after the injection of immune complexes. Perilymph was aspirated on the fourth, tenth, 21st, and 60th days after the inoculation. The mean concentrations of albumin, IgG, histamine, and prostaglandin E2 (PGE2) were significantly greater in PL obtained from OME-induced ears than in those from normal control ears. The 3H-PGE2 placed on the RWM of pathologically affected ears passed into PL in significantly greater amounts, compared to normal control ears. The findings of the present study indicate that MEE affect the biochemical milieu of PL.
Insights
Middle ear effusion (MEE) significantly alters inner ear fluid composition. This study shows MEE increases albumin, IgG, histamine, and prostaglandin E2 in perilymph, impacting round window membrane permeability.
Area of Science:
- Otolaryngology
- Biochemistry
- Experimental Otitis Media Research
Context:
- Otitis media with effusion (OME) is a common condition affecting the middle ear.
- The effects of middle ear effusion on the inner ear's biochemical environment are not fully understood.
- Investigating the round window membrane's role in mediating these effects is crucial.
Purpose:
- To determine how middle ear effusion influences the biochemical composition of perilymph.
- To assess the impact of effusion on the permeability of the round window membrane.
- To quantify changes in key biochemical markers within the perilymph during experimental OME.
Summary:
- Experimental otitis media with effusion was induced in chinchillas.
- Perilymph samples were collected at various time points and analyzed for albumin, IgG, histamine, and prostaglandin E2 (PGE2).
- Increased concentrations of these substances were found in the perilymph of OME-induced ears compared to controls, indicating MEE alters perilymph biochemistry.
Impact:
- Findings suggest middle ear effusion directly affects the perilymph's biochemical milieu.
- The study highlights potential mechanisms by which middle ear effusion may influence inner ear function.
- This research provides insights into the pathophysiology of hearing loss associated with OME.