Background: Because inflammation induces oxidative stress, exhaled hydrogen peroxide (H2O2), which is a marker of oxidative stress, may be used as a non-invasive marker of airway inflammation in chronic obstructive pulmonary disease (COPD). There are no data on the circadian variability of exhaled H2O2 in COPD patients. Objective: The aim of this study was to investigate the variability of the H2O2 concentration in breath condensate of stable COPD patients and of matched healthy control subjects. Methods: We included 20 patients with stable mild COPD (forced expiratory volume in 1 s ∼70% of predicted) and 20 healthy subjects, matched for age, sex and pack-years, all smokers or ex-smokers. Breath condensate was collected and its H2O2 concentration determined fluorometrically three times on day 0 (9 and 12 a.m., and 3 p.m.) and once on days 1, 2, 3, 8 and 21. Results: The mean H2O2 concentration increased significantly during the day in both the patient and control groups (p = 0.02 and p < 0.01, respectively). Over a longer period up to 21 days, the mean concentration did not change in both groups. There was no significant difference between patients and controls. The mean coefficient of variation over 21 days was 45% in the patient group and 43% in the control group (p = 0.8). Conclusions: The exhaled H2O2 concentration increased significantly during the day in both stable COPD patients and controls. Over a period of 3 weeks, the mean H2O2 concentration did not change and the variability within the subjects was similar in both groups.

Keywords:
Chronic obstructive pulmonary disease, Hydrogen peroxide, Oxidative stress, Variability
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2002
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