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Relationship between exhaled nitric oxide and childhood asthma
T L Frank1, A Adisesh, A C Pickering
1North West Lung Centre, Wythenshawe Hospital, and Royal College of General Practitioners Manchester Research Unit, Parkway House, Manchester, UK.
American Journal of Respiratory and Critical Care Medicine
|October 14, 1998
Summary
Exhaled nitric oxide levels are higher in children with atopic asthma. Nonatopic asthmatic children showed similar exhaled nitric oxide levels to nonasthmatic children.
Area of Science:
- Pediatric Pulmonology
- Allergy and Immunology
- Biomarkers
Background:
- Asthma diagnosis in children can be challenging.
- Exhaled nitric oxide (eNO) is a potential biomarker for airway inflammation.
- Atopy, a genetic tendency to develop allergic diseases, is common in childhood asthma.
Purpose of the Study:
- To investigate the relationship between exhaled nitric oxide levels and the asthmatic and atopic status in children.
- To evaluate eNO as a potential diagnostic marker differentiating asthma phenotypes.
Main Methods:
- Measured exhaled nitric oxide (eNO) in 93 children using chemiluminescence.
- Assessed asthma status through clinical consensus and exercise challenge tests.
- Determined atopic status via skin prick testing.
Main Results:
- Atopic asthmatic children exhibited significantly higher eNO levels (12.5 ppb) compared to nonatopic asthmatics (3.2 ppb), atopic nonasthmatics (3.8-5.7 ppb), and nonatopic nonasthmatics (3.4-3.5 ppb).
- eNO levels were elevated in atopic asthmatics but not in nonatopic asthmatics.
- Nonatopic asthmatics had eNO levels comparable to nonasthmatic children.
Conclusions:
- Exhaled nitric oxide is a useful biomarker for identifying atopic asthma in children.
- Elevated eNO levels may help distinguish atopic asthmatic phenotypes from other respiratory conditions.
- Further research can explore eNO's role in routine pediatric respiratory screening.