Tailored interventions based on exhaled nitric oxide versus clinical symptoms for asthma in children and adults

Petsky, H. L., Cates, C. J., Li, A., Kynaston, J. A., Turner, C. and Chang, A. B. (2009) Tailored interventions based on exhaled nitric oxide versus clinical symptoms for asthma in children and adults. Cochrane Database of Systematic Reviews, 4: . doi:10.1002/14651858.CD006340.pub3


Author Petsky, H. L.
Cates, C. J.
Li, A.
Kynaston, J. A.
Turner, C.
Chang, A. B.
Title Tailored interventions based on exhaled nitric oxide versus clinical symptoms for asthma in children and adults
Journal name Cochrane Database of Systematic Reviews   Check publisher's open access policy
ISSN 1469-493X
Publication date 2009
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1002/14651858.CD006340.pub3
Issue 4
Total pages 44
Place of publication Oxford, United Kingdom
Publisher John Wiley & Sons
Language eng
Formatted abstract
Background The measurement of severity and control of asthma in both children and adults can be based on subjective or objective measures. It has been advocated that fractional exhaled nitric oxide (FeNO) can be used to monitor airway inflammation as it correlates with some markers of asthma. Interventions for asthma therapies have been traditionally based on symptoms and/or spirometry. 

Objectives To evaluate the efficacy of tailoring asthma interventions based on exhaled nitric oxide in comparison to clinical symptoms (with or without spirometry/peak flow) for asthma related outcomes in children and adults.

Search strategy We searched the Cochrane Airways Group Specialised Register of Trials, the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, EMBASE and reference lists of articles. The last search was completed in February 2009.

Selection criteria All randomised controlled comparisons of adjustment of asthma therapy based on exhaled nitric oxide compared to traditional methods (primarily clinical symptoms and spirometry/peak flow).

Data collection and analysis Results of searches were reviewed against pre-determined criteria for inclusion. Relevant studieswere independently selected in duplicate. Two authors independently assessed trial quality and extracted data. Authors were contacted for further information with response from one. 

Main results Two studies have been added for this update, which now includes six (2 adults and 4 children/adolescent) studies; these studies differed in a variety of ways including definition of asthma exacerbations, FeNO cut off levels, the way in which FeNO was used to adjust therapy and duration of study. Of 1053 participants randomised, 1010 completed the trials. In the meta-analysis, there was no significant difference between groups for the primary outcome of asthma exacerbations or for other outcomes (clinical symptoms, FeNO level and spirometry). In post-hoc analysis, a significant reduction in mean final daily dose inhaled corticosteroid per adult was found in the group where treatment was based on FeNO in comparison to clinical symptoms, (mean difference -450 mcg; 95% CI -677 to - 223 mcg budesonide equivalent/day). However, the total amount of inhaled corticosteroid used in one of the adult studies was 11% greater in the FeNO arm. In contrast, in the paediatric studies, there was a significant increase in inhaled corticosteroid dose in the FeNO strategy arm (mean difference of 140 mcg; 95% CI 29 to 251, mcg budesonide equivalent/day). 

Authors’ conclusions Tailoring the dose of inhaled corticosteroids based on exhaled nitric oxide in comparison to clinical symptoms was carried out in different ways in the six studies and found onlymodest benefit at best and potentially higher doses of inhaled corticosteroids in children. The role of utilising exhaled nitric oxide to tailor the dose of inhaled corticosteroids cannot be routinely recommended for clinical practice at this stage and remains uncertain. 
Keyword Adrenal Cortex Hormones [*administration & dosage]
Anti-Asthmatic Agents [*administration & dosage]
Asthma [*drug therapy; metabolism]
Biological Markers [analysis]
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: ERA 2012 Admin Only
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