ALB and chronic obstructive pulmonary disease: Factors with P < 0.25 or considered clinically significant were further analyzed by multivariate logistic regression analysis, including sex, BMI, smoking history, drinking history, hypertension, COPD, atrial fibrillation, renal insufficiency, pulmonary edema, general surgery history, pulmonary artery hypertension, pericardial effusion, diameters of the left and right atrium, left ventricular ejection fraction, white blood cell count (WBC) count, hemoglobin, serum albumin, globulin, creatinine, surgical types, CPB time, and transfusion of RBCs.