Degree of control of patients with chronic obstructive pulmonary disease in Spain: SINCON study.

Background: Disease control is an important objective of COPD management. The SINCON study evaluated the level of control in terms of respiratory symptoms and exacerbations in Spanish patients with COPD for ≥2 years.

Methods: SINCON was a descriptive, cross-sectional, multicenter study that assessed degree of control using a combined index comprising COPD assessment test (CAT), modified Medical Research Council dyspnea scale (mMRC), and number of moderate/severe exacerbations in the last year. Based on this score, patients were categorized as "well controlled" or "poorly controlled". Degree of control was also assessed relative to patient phenotype, setting (primary care [PC] vs respiratory care [RC]), and impact of treatment on morning symptoms.

Results: Of the 481 patients (PC: 307, RC: 174) analyzed, COPD was poorly controlled in 63.2%. Some differences were found between clinical settings: PC patients were more poorly controlled (PC: 66.4% vs RC: 57.5%; P = 0.06) and had higher CAT score (PC: 17.9 vs RC: 15.5; P < 0.05), and higher rate of moderate/severe exacerbations during previous year (PC: 1.5 vs RC: 1.1; P < 0.05), while dyspnea degree was similar in both settings. Regarding phenotypes, non-exacerbators demonstrated better control vs exacerbators. Morning symptoms score improved between waking and 3 h after bronchodilator treatment (P < 0.05), with greater improvements in PC patients (PC: - 6.5 vs RC: - 5.0 points; P < 0.05).

Conclusions: Most COPD patients were poorly controlled with some differences observed between PC and RC settings and between patient phenotypes. Our index may be easily used in PC settings to optimize COPD treatment.