Biomarkers in adult asthma: a systematic review of 8-isoprostane in exhaled breath condensate

Adam M Peel, Christina-Jane Crossman-Barnes, Jonathan Tang, Stephen Fowler, Gwyneth Davies, Andrew Wilson, Yoon Loke

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18 Citations (Scopus)
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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: A systematic 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 I2. 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 22pg/ml. Confidence in the result is limited by the small number of studies and by substantial statistical heterogeneity (I2 = 94). Conclusion: The clinical value of EBC 8-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 EBC 8-isoprostane in asthma is to be properly evaluated.
Original languageEnglish
Article number016011
JournalJournal of Breath Research
Issue number1
Early online date19 Jan 2017
Publication statusPublished - Mar 2017

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