Data collection
The demographic characteristics and laboratory data were collected by reviewing patients’ medical records. Echocardiography was performed on admission and left atrial diameter (LAD), left ventricular ejection fraction (LVEF) were obtained. Demographic characteristics included gender, age, race, height, weight, body mass index (BMI), smoking status, drinking, heart rate on admission and underlying disease. Peripheral blood samples were obtained by vacutainer tubes at the time of admission, after at least 12 hours of fasting. The following hematological parameters were measured using automated hematology analyzing devices: white blood cell count (WBC), red blood cell count (RBC), hemoglobin (Hb), platelet count (PLT), differential white blood cell count (neutrophils, monocytes, lymphocytes, eosinophils and basophiles). Glucose, alanine aminotransferase (ALT), aspartic transaminase (AST), albumin, serum creatinine (Cr), uric acid (UA), blood urea nitrogen (BUN), total cholesterol (TC), triglyceride (TG), low-density lipoprotein (LDL), high-density lipoprotein (HDL), estimated glomerular filtration rate (eGFR), D-dimer, C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) were also evaluated. Neutrophils, platelet count and lymphocytes were expressed as ×109 cells/L. The SII was measured as neutrophil count × platelet count/lymphocyte count.