Fractionated breath condensate sampling: H 2 O 2 concentrations of the alveolar fraction may be related to asthma control in children

Background Asthma is a chronic inflammatory disease of the airways but recent studies have shown that alveoli are also subject to pathophysiological changes. This study was undertaken to compare hydrogen peroxide (H2O2) concentrations in different parts of the lung using a new technique of fractioned breath condensate sampling.