Demographic and clinical characteristics of patients with AECB or stable CB.

Data are expressed as median (IQR), unless otherwise specified.AECB: acute exacerbation of chronic bronchitis; CB: chronic bronchitis; LV: left ventricular; eGFR: estimated glomerular filtration rate; PaO2: artery partial pressure of oxygen; PaCO2: artery partial pressure of carbon dioxide; LVEF: Left ventricular ejection fraction; FEV1: forced expired volume in one second; FVC: forced vital capacity; SPAP: systolic pulmonary artery pressure.*Presence of Q wave, ST depression, ST elevation or T wave inversed.Δp⋇p