Fig. 1
From: Dysregulation of the endothelial nitric oxide pathway is associated with airway inflammation in COPD
Serum L-arginine/ADMA in smoking controls and patients with COPD. Serum L-arginine/ADMA was analysed among smoking control and patients with stable and exacerbated COPD (a, ANOVA with post-hoc test) and between the onset and the recovery of an acute severe exacerbation (b, paired t-test). Correlation between serum ADMA concentration and blood neutrophil percentage and FENO was also analysed in patients with stable and exacerbated COPD (c and d, Pearson correlation). Control: smoking control subjects, S-COPD: stable COPD, E-COPD: exacerbation of COPD, FENO: fractional exhaled nitric oxide concentration. *p < 0.05, **p < 0.01 vs. Control. Data are shown as mean and standard deviation