Introduction
AECOPD, COPD
CHRONIC OBSTRUCTIVE PULMONARY DISEASE, COPD, SECONDARY, DISEASE
Acute exacerbations of chronic obstructive pulmonary disease (AECOPD) are associated with increased morbidity, mortality, and healthcare cost [We aimed to identify clinical, radiographic, and laboratory characteristics that might help distinguish AECOPD from symptoms secondary to another dominant disease in patients with a history of COPD.