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Inhaled Fluticasone and Salmeterol Suppress Eosinophilic Airway Inflammation in Chronic Obstructive Pulmonary Disease: Relations with Lung Function and Bronchodilator Reversibility

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Abstract

The aim of this study was to determine whether combined inhaled corticosteroids and long-acting β2 agonists can suppress eosinophilic inflammation in chronic dostructive plumonary disease (COPD) and to investigate the association between the level of eosinophilia and the degree of bronchodilator reversibility. Sixty-two patients with stable COPD (forced expiratory volume in 1 [FEV1] of 30%–70% predicted before bronchodilation) were enrolled from our outpatient clinic. Patients received inhaled fluticasone (100 µg)/salmeterol (50 µg) twice daily for two months. Lung function measurements, bronchodilator tests, and sputum induction were performed. The number of inflammatory cells and mediators, including interleukin-8 (IL-8), tumor necrosis factor-α (TNF-α), and eosinophilic cationic protein (ECP), were measured. Treatment with inhaled fluticasone and salmeterol significantly suppressed eosinophilic inflammation in COPD patients with sputum eosinophilia (mean 8.9% ± 2.0% vs. 1.6% ± 0.5%, p = 0.003), but insignificant differences in FEV1 and FVC between patients with and without eosinophilia suggested that suppression of eosinophilic inflammation had no effect on FEV1 or FVC. Reduction in the percentage of eosinophils was significantly correlated with decreased levels of ECP (r = 0.48, p < 0.001). Levels of neutrophils, IL-8, and TNF-α were not affected. Sputum eosinophilia was not related to the degree of bronchodilator reversibility. The degree of bronchodilator reversibility did not predict the increase in FEV1 and FVC after treatment with inhaled corticosteroids/long-acting β2 agonists. Suppression of eosinophilic inflammation and bronchodilator responsiveness indices were not correlated with clinical outcomes in COPD patients treated with inhaled corticosteroids/long-acting β2 agonists.

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Acknowledgments

This work was funded by a research grant (VGH94-305) from the Taipei Veterans General Hospital, Taiwan.

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Correspondence to Diahn-Warng Perng.

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Diahn-Warng Perng and Cheng-Che Wu contributed equally to this work.

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Perng, DW., Wu, CC., Su, KC. et al. Inhaled Fluticasone and Salmeterol Suppress Eosinophilic Airway Inflammation in Chronic Obstructive Pulmonary Disease: Relations with Lung Function and Bronchodilator Reversibility. Lung 184, 217–222 (2006). https://doi.org/10.1007/s00408-005-2586-8

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  • DOI: https://doi.org/10.1007/s00408-005-2586-8

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