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Neutrophil elastase-alpha 1-antitrypsin in middle ear fluid in chronic otitis media with effusion
1Department of Otolaryngology-Head & Neck Surgery, St Mary's Hospital, London, UK.
Insights
Mucoid middle ear effusions in children show significantly higher levels of neutrophil elastase-alpha 1-antitrypsin compared to serous effusions. This suggests a more severe inflammatory response and ongoing neutrophil activity contributing to persistent middle ear effusions.
Area of Science:
- Otolaryngology
- Pediatric Medicine
- Immunology
Background:
- Middle ear effusions (MEE) are common in children.
- Understanding the inflammatory processes in MEE is crucial for effective treatment.
- Neutrophil elastase and its inhibitor, alpha 1-antitrypsin, are key markers of neutrophil activity.
Purpose of the Study:
- To quantify neutrophil elastase-alpha 1-antitrypsin levels in serous versus mucoid middle ear effusions.
- To investigate the association between effusion type and inflammatory markers.
- To explore the role of neutrophil activity in the persistence of middle ear effusions.
Main Methods:
- Samples from 17 children undergoing myringotomy and grommet insertion were analyzed.
- Middle ear effusions were classified as serous or mucoid.
- Neutrophil elastase-alpha 1-antitrypsin was quantified using enzyme-linked immunosorbent assay (ELISA).
Main Results:
- Mean neutrophil elastase-alpha 1-antitrypsin levels were significantly higher in mucoid effusions (50.6 ± 38.3 µg/ml) compared to serous effusions (5.3 ± 4.8 µg/ml).
- A statistically significant difference (P < 0.05) was observed between the two effusion types.
- Exclusion criteria included recent infection or antimicrobial therapy.
Conclusions:
- Mucoid middle ear effusions may indicate a more severe inflammatory response.
- Persistent neutrophil activity in the middle ear mucosa could contribute to the chronicity of certain middle ear effusions.
- These findings highlight the role of neutrophil-mediated inflammation in pediatric otitis media with effusion.
Abstract:
Neutrophil elastase-alpha 1-antitrypsin was quantified in samples taken from middle ear effusions collected at operation from 17 children attending for elective myringotomy and grommet insertion. At the time of surgery the effusion was classified as serous or mucoid. Children with a recent history of infection or antimicrobial therapy were excluded. The quantification of immunoreactive neutrophil elastase was by means of enzyme-linked immunosorbant assay (ELISA). The mean value of neutrophil elastase-alpha 1-antitrypsin was 50.6 +/- 38.3 (SD) micrograms/ml in mucoid effusions, which was significantly higher (P < 0.05) than that in serous effusions (5.3 +/- 4.8 micrograms/ml). These results indicate that a mucoid effusion may reflect a more severe inflammatory response and that persistence of neutrophil activity in the middle ear mucosa may contribute to the persistence of at least one group of middle ear effusions.