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 .