Abstract

CAMARGO, Bethy et al. Heterogeneidad en los fenotipos inflamatorios de los pacientes con EPOC: rol del recuento celular diferencial en esputo. Rev. am. med. respir. [online]. 2016, vol.16, n.2, pp.128-136. ISSN 1852-236X.

Smoking is the major cause of COPD; however factors such as age, previous history of asthma, exacerbations, and genetic predisposition could infuence the development of the disease. This could be related with the phenotypes of COPD patients, who would have different responses to inhaled corticosteroids (ICs). Recently, it has been suggested that eosinophils are potential biomarkers that contribute to predict good response to ICs. To test the hypothesis that the presence of eosinophils in sputum could be useful to characterize different phenotypes of COPD patients, we assessed the infammatory cell profles in induced sputum samples from not exacerbated COPD patients. 20 patients with moderate to severe COPD, attending a pulmonary rehabilitation gym, were grouped into eosinophilic (8 patients who presented more than 3% eosinophils in the induced sputum sample) or neutrophilic (9 patients who had more than 60% neutrophils). Only 3 patients were excluded due to contamination of the sputum with epithelial cells. Although there were no-signifcant differences in the pulmonary function tests or the 6-minute walk, the patients with eosinophilia showed higher responsiveness to bronchodilator therapy. Besides this group presented an increase of peripheral eosinophils, higher FeNO and better quality of life (measured by questionnaires) compared with the neutrophilic patients. Induced sputum is an economic non-invasive technique and would be a useful tool to know different infammatory phenotypes in COPD patients.

Keywords : Induced sputum; COPD; Eosinophils; Phenotypes; Inhaled corticosteroids.

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