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Am. J. Respir. Crit. Care Med., Volume 162, Number 5, November 2000, 1773-1777

Partial Reversibility of Airflow Limitation and Increased Exhaled NO and Sputum Eosinophilia in Chronic Obstructive Pulmonary Disease

ALBERTO PAPI, MICAELA ROMAGNOLI, SIMONETTA BARALDO, FAUSTO BRACCIONI, IPPOLITO GUZZINATI, MARINA SAETTA, ADALBERTO CIACCIA, and LEONARDO M. FABBRI

Research Center on Asthma and COPD, University of Ferrara, Ferrara, Italy; Institute of Occupational Medicine, University of Padua, Padua; and University of Modena, Modena, Italy

We investigated the relationship between the reversibility of airflow limitation, the concentration of nitric oxide (NO) in exhaled air, and the inflammatory cells in the sputum of patients with stable chronic obstructive pulmonary disease (COPD). We examined nine normal healthy control subjects and 20 nonatopic patients with COPD. Ten patients had no reversibility of airflow limitation (increase in FEV1 of < 12% and < 200 ml after 200 µg of inhaled salbutamol), and 10 patients had partial reversibility of airflow limitation (increase in FEV1 of < 12% but > 200 ml after 200 µg of inhaled salbutamol). Exhaled NO levels were higher in COPD patients with partial reversibility of airflow limitation than in those with no reversibility of airflow limitation (median 24 [interquartile range 15.3 to 32] ppb versus 8.9 [4.6 to 14.7] ppb; p < 0.01). Compared with healthy control subjects, only COPD patients with partial reversibility of airflow limitation had increased concentrations of sputum eosinophils. We conclude that, in patients with stable COPD, even a partial bronchodilator response to inhaled salbutamol is associated with increased exhaled NO and sputum eosinophilia, suggesting that these patients may have a different response to treatment than do those without reversible airflow limitation.




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