Exhaled nitric oxide and biomarkers in exhaled breath condensate indicate the presence, severity and control of childhood asthma
Article first published online: 26 JUL 2007
Clinical & Experimental Allergy
Volume 37, Issue 9, pages 1303–1311, September 2007
How to Cite
Robroeks, C. M. H. H. T., Van De Kant, K. D. G., Jöbsis, Q., Hendriks, H. J. E., Van Gent, R., Wouters, E. F. M., Damoiseaux, J. G. M. C., Bast, A., Wodzig, W. K. W. H. and Dompeling, E. (2007), Exhaled nitric oxide and biomarkers in exhaled breath condensate indicate the presence, severity and control of childhood asthma. Clinical & Experimental Allergy, 37: 1303–1311. doi: 10.1111/j.1365-2222.2007.02788.x
- Issue published online: 26 JUL 2007
- Article first published online: 26 JUL 2007
- Submitted 29 November 2006; revised 2 April 2007; accepted 20 June 2006
- exhaled breath condensate;
- fractional exhaled nitric oxide;
Background Exhaled nitric oxide and inflammatory biomarkers in exhaled breath condensate may be useful to diagnose and monitor childhood asthma. Their ability to indicate an asthma diagnosis, and to assess asthma severity and control, is largely unknown.
Objective To study (1) the ability of exhaled nitric oxide and inflammatory markers in exhaled breath condensate (nitrite, nitrate, hydrogen peroxide, 8-isoprostane, IFN-γ, TNF-α, IL-2, -4, -5, -10 and acidity) to discriminate between childhood asthma and controls. (2) The ability of these biomarkers to indicate asthma severity and control.
Methods One-hundred and fourteen children were included: 64 asthmatics (10.7±3.0 years, 67.2% atopic) and 50 controls (10.0±0.4 years). Condensate was collected using a glass condenser.
Results Exhaled nitric oxide, IFN-γ and IL-4 in exhaled breath condensate differed significantly between asthma and controls. Multivariate backward logistic regression models demonstrated that IL-4 (odds ratio 7.9, 95% confidence interval 1.2–51.0) was the only significant indicator of an asthma diagnosis. Asthma control was best assessed by exhaled nitric oxide, 8-isoprostane, IFN-γ and IL-4 (sensitivity 82%, specificity 80%, P<0.05), whereas exhaled nitric oxide, 8-isoprostane, nitrate and nitrite in condensate were the best indicators of asthma severity (sensitivity 89%, specificity 72%, P<0.05).
Conclusion Different markers in condensate are of an additional value to exhaled nitric oxide, and are needed in non-invasive inflammometry. They could be useful to diagnose asthma and to indicate asthma control and severity in childhood.