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Adenoid histamine and its possible relationship to secretory otitis media
Insights
Adenoid tissue in children with otitis media with effusion (fluid in the ear) contains higher histamine levels. Removing adenoids may reduce ear inflammation by eliminating this source.
Area of Science:
- Otorhinolaryngology
- Pediatric Medicine
- Immunology
Background:
- Otitis media with effusion (OME) is common in children.
- Adenoid hypertrophy is often implicated in OME.
- The role of inflammatory mediators in adenoid tissue is not fully understood.
Purpose of the Study:
- To investigate histamine levels in adenoid tissue of children with and without OME.
- To explore associations between histamine content and clinical symptoms.
- To evaluate the potential role of adenoids as a source of inflammatory mediators in OME.
Main Methods:
- Adenoid tissue samples were collected during surgery.
- Histamine content was measured in adenoid tissue.
- Clinical data including presence of middle ear effusion and symptoms were recorded.
- Statistical analysis was performed to compare groups and identify associations.
Main Results:
- Adenoid tissue from children with OME had significantly higher histamine levels compared to controls.
- Mouth breathing and nasal obstruction were correlated with higher adenoid histamine.
- Histamine was detected in nasopharyngeal secretions and middle ear fluid.
- No significant difference in adenoid weight was observed between groups.
Conclusions:
- Adenoid tissue is a significant source of histamine in children, particularly those with OME.
- Adenoidectomy may benefit children with OME by removing this source of inflammation.
- Further research is needed to identify the precise source and release mechanism of histamine.
Abstract:
We have shown that adenoid tissue contains large amounts of the inflammatory mediator histamine. Children with fluid present in both ears at operation were found to have increased amounts of histamine in their adenoid tissue compared to a group with no signs or symptoms of SOM. Also mouth breathing and nasal obstruction were associated with adenoid histamine content whereas other signs and symptoms were not. No significant differences in adenoid weight were seen between SOM and non SOM patients. Histamine, both free and cell-associated, was found in nasopharyngeal secretions and middle-ear fluid although the source and mechanism of release has not yet been identified. We suggest that the benefits of adenoidectomy in children with SOM may possibly come from removing a potential source of inflammatory mediators in the vicinity of the Eustachian tube.