Abstract:Objective To explore the changes and correlation analysis of fractional exhaled nitric oxide (FeNO) and peripheral blood IL-8, TNF-α, VEGF levels in COPD patients. Methods A total of 75 cases of COPD of acute exacerbations stage in our hospital were selected as observation group, 65 cases of COPD of stable stage in our hospital were selected as control group 1, and 45 healthy people in our hospital were selected as control group 2. The levels of FeNO, lung function and peripheral blood IL-8, TNF-α and VEGF were compared in three groups, and the correlation between FeNO and peripheral blood IL-8, TNF-α and VEGF in observation group was analyzed. Results ① FEV1 and FEV1/FVC in observation group was significantly lower than that in control group 1 (P?0.05), and FEV1 and FEV1/FVC in control group 1 was significantly lower than that in control group 2 (P?0.05). ② The level of FeNO, IL-8, TNF- and VEGF in observation group was significantly lower than that in control group 1 and control group 2 (P?< 0.05), but the level of FeNO, IL-8, TNF-α and VEGF in control group 1 was significantly lower than that in control group 2 (P?0.05). ③ In observation group, FeNO was positively correlated with IL-8 (r?=?0.535, P?=?0.000), TNF-α (r?= 0.313, P?0.006) and VEGF (r?=?0.226, P?=?0.049). Conclusions The levels of FeNO and peripheral blood IL-8, TNF-α and VEGF in patients with COPD of acute exacerbations stage are higher than those in patients with COPD of stable stage and healthy people, and there is a positive correlation between them. It may be a clinical diagnostic indicator, but still needs further study.