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COPD is characterized by chronic air-flow limitation. Smoking is the most important factor in the pathogenesis of COPD. Smoking is associated with increased oxidative stress in the lungs. In this study our aim was to evaluate the differences in the burden of oxidative stress  in patients with COPD, smokers, and non-smokers by measuring hydrogen peroxide (H(2)O(2)), malondialdehyde (MDA), and 8-isoprostane levels in the exhaled breath condensate (EBC) samples.

Oxidative Stress Levels in Exhaled Breath Condensate Associated With COPD and Smoking