The Effect of Beclomethasone/Formoterol in Extra-fine Formulation on Quality of Life and SAD in COPD Patients.

In recent years, there has been a growing interest in deepening the contribution of small airways (with a diameter \<2mm) to the clinical expression of Chronic Obstructive Pulmonary Disease (COPD). In patients with stable COPD, SAD severity was found to be progressively increased both with the degree of airflow obstruction and with GOLD risk class. Moreover, a correlation between SAD and COPD impact measured with the CAT (COPD Assessment Test) was found, being the severity of SAD a predictor of the impact of the disease (CAT≥10). A close correlation between SAD and both quality of life (measured with the St. George's Respiratory Questionnaire) and perceived dyspnea (measured with the modified Medical Research Council-mMRC scale) was also found in COPD patients. The exact role of SAD as a specific 'pharmacological target' is not yet fully known. According to the guidelines, the administration of combination such as Beclomethasone dipropionate/Formoterol fumarate (BDP/FF) in extra-fine formulation produced a clinically relevant improvement in quality of life (\> 4 units in the St. George's Respiratory Questionnaire) and in dyspnea. However, it is not yet defined whether exists a correlation between symptomatic improvement and SAD and whether an improvement of symptoms can be achieved acting pharmacologically on SAD. The rationale for this study is based on the hypothesis that an extra-fine formulation of BDP/FF, designed to target the entire bronchial three, included the peripheral zone, can improve the impact of the disease on the quality of life of COPD patients, acting on SAD. The functional indices of SAD used in this study are from the impulse oscillometry system (IOS), the standard spirometry and the body plethysmography. The primary endpoint of the study was, therefore, an improvement of the impact of the disease on quality of daily life (CAT) and of dyspnea (mMRC) after 12th week treatment with an extra-fine formulation of BDP/FF in a cohort of COPD patients with severe airway obstruction and one moderate exacerbation in a previous year; secondary endpoint was an improvement of the SAD at the 12th week in these patients.