BACKGROUND AND OBJECTIVE: Fractional exhaled nitric oxide (FENO) has been implicated as a pulmonary biomarker in various respiratory diseases, including COPD. In this longitudinal study, the benefit of measuring FENO in a routine clinical setting was assessed in COPD patients hospitalized with an exacerbation of the disease. METHODS: FENO, lung function and blood gases were measured in 58 COPD patients at hospital admission due to an exacerbation, and at discharge following treatment with corticosteroids and bronchodilators. RESULTS: FENO levels were significantly decreased at discharge, compared with those at admission (geometric mean 25.3 ppb (95% CI: 21.2-30.1) vs 19.7 ppb (95% CI: 17.2-22.6); P = 0.002). There was a significant positive correlation between FENO concentrations at admission and the increase in FEV(1) after treatment (r = 0.441, P < 0.001), and a significant inverse correlation between FENO values at admission and the mean length of hospital stay (r = -0.297, P = 0.016). Using receiver operating characteristic curve analysis, the optimum cut point for FENO as a predictor for significant increase in FEV(1) was 26.8 ppb (sensitivity: 74%, specificity: 75%). There were no correlations between FENO levels and absolute values for lung function variables at admission or discharge. CONCLUSIONS: These data suggest that FENO levels determined at hospital admission may predict the overall response to treatment in COPD patients with acute exacerbations.
BACKGROUND AND OBJECTIVE: Fractional exhaled nitric oxide (FENO) has been implicated as a pulmonary biomarker in various respiratory diseases, including COPD. In this longitudinal study, the benefit of measuring FENO in a routine clinical setting was assessed in COPDpatients hospitalized with an exacerbation of the disease. METHODS:FENO, lung function and blood gases were measured in 58 COPDpatients at hospital admission due to an exacerbation, and at discharge following treatment with corticosteroids and bronchodilators. RESULTS:FENO levels were significantly decreased at discharge, compared with those at admission (geometric mean 25.3 ppb (95% CI: 21.2-30.1) vs 19.7 ppb (95% CI: 17.2-22.6); P = 0.002). There was a significant positive correlation between FENO concentrations at admission and the increase in FEV(1) after treatment (r = 0.441, P < 0.001), and a significant inverse correlation between FENO values at admission and the mean length of hospital stay (r = -0.297, P = 0.016). Using receiver operating characteristic curve analysis, the optimum cut point for FENO as a predictor for significant increase in FEV(1) was 26.8 ppb (sensitivity: 74%, specificity: 75%). There were no correlations between FENO levels and absolute values for lung function variables at admission or discharge. CONCLUSIONS: These data suggest that FENO levels determined at hospital admission may predict the overall response to treatment in COPDpatients with acute exacerbations.
Authors: Mario Malerba; Alessandro Radaeli; Alessia Olivini; Giovanni Damiani; Beatrice Ragnoli; Paolo Montuschi; Fabio L M Ricciardolo Journal: Biomed Res Int Date: 2014-02-27 Impact factor: 3.411