Asthma-chronic obstructive pulmonary disease overlap: Results from a national-multicenter study

Asthma-chronic obstructive pulmonary disease overlap: Results from a national-multicenter studyIntroduction: Patients with asthma-chronic obstructive pulmonary disease (COPD) overlap (ACO) have a greater disease burden than those with COPD or asthma alone.In this study, it was aimed to determine the prevalence, risk factors, and clinical features of ACO because there are limited national data in Türkiye. Materials and Methods:The study was conducted in a cross-sectional design in nine tertiary-care hospitals.The patients followed with a diagnosis of asthma or COPD for at least one year were enrolled in the study.The frequency of ACO and the characteristics of the patients were evaluated in the asthma and COPD groups.