Abbreviations: Feno = exhaled nitric oxide;
IL = interleukin; IS = induced sputum;
LTB4 = leukotriene B4
Airway inflammation is an important mechanism underlying deterioration
in COPD and can be noninvasively assessed by exhaled nitric oxide
(Feno) and induced sputum (IS). We wished to examine the
short-term reproducibility of Feno and IS in a cohort of
subjects with COPD.