Abbreviations: SD, standard deviation; IQR, interquartile range; COPD, chronic obstructive pulmonary disease; BNP, brain natriuretic peptide; LVEF, left ventricular ejection fraction; LVDd, left ventricular end-diastolic dimension; IVSd, interventricular end-diastolic thickness; PASP, pulmonary artery systolic pressure; SI conversion factors: To convert creatine kinase to μkat/L, multiply by 0.0167. *P < 0.05 ; **P < 0.01 .