Journal
JOURNAL OF BREATH RESEARCH
Volume 11, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1752-7163/aa5a8a
Keywords
exhaled breath condensate; 8-isoprostane; asthma
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Funding
- University of East Anglia - Asthma UK Centre for Applied Research
- Asthma UK [AUK-AC-2012-01] Funding Source: researchfish
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Objectives. We aimed to assess the evidence for the use of 8-isoprostane in exhaled breath condensate (EBC) as a biomarker in adult asthma. Design. Asystematic review and meta-analysis of EBC 8-isoprostane. Methods. We searched a number of online databases (including PubMed, Embase and Scopus) in January 2016. We included studies of adult non-smokers with EBC collection and asthma diagnosis conducted according to recognised guidelines. We aimed to pool data using random effects meta-analysis and assess heterogeneity using I-2. Results. We included twenty studies, the findings from which were inconsistent. Seven studies (n = 329) reported 8-isoprostane levels in asthma to be significantly higher than that of control groups, whilst six studies (n = 403) did not. Only four studies were appropriate for inclusion in a random effects meta-analysis of mean difference. This found a statistically significant between-groups difference of 22 pg ml(-1). Confidence in the result is limited by the small number of studies and by substantial statistical heterogeneity (I-2 = 94). Conclusion. The clinical value of EBC8-isoprostane as a quantitative assessment of oxidative stress in asthma remains unclear due to variability in results and methodological heterogeneity. It is essential to develop a robust and standardised methodology if the use of EBC8-isoprostane in asthma is to be properly evaluated.
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