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Biochemical characteristics of middle ear effusions
The Annals of Otology, Rhinology, and Laryngology
|March 1, 1976
Summary
Biochemical analysis revealed higher protein, potassium, and enzyme concentrations in human middle ear effusions (MEE) compared to serum. These findings support the inflammatory origin of MEE.
Area of Science:
- Biochemistry
- Otolaryngology
- Pathophysiology
Background:
- Middle ear effusions (MEE) are a hallmark of otitis media.
- Understanding the biochemical composition of MEE is crucial for diagnosing and treating middle ear infections.
Purpose of the Study:
- To compare the biochemical composition of MEE and serum in experimentally induced middle ear inflammation in squirrel monkeys and in human otitis media.
- To investigate the origins of enzymes found in MEE.
Main Methods:
- Comparison of protein concentrations, potassium, glucose, and enzyme activities (oxidative and hydrolytic) in MEE and serum.
- Analysis of lactate dehydrogenase isoenzyme patterns using electropherograms.
Main Results:
- Human MEE showed higher total protein, potassium, and lower glucose concentrations than serum.
- Enzyme activities (lactate dehydrogenase, malate dehydrogenase, leucine aminopeptidase, alkaline phosphatase, acid phosphatase, lysozyme) were significantly higher in MEE than serum.
- Lactate dehydrogenase isoenzyme fractions 4 and 5 were more active in MEE, suggesting inflammatory and cellular origins.
Conclusions:
- Elevated enzyme activities in MEE support the hypothesis that MEE results from inflammatory processes.
- Enzymes in MEE likely originate from blood, inflamed middle ear mucosa, and leukocytes.