Data Collection
Detailed clinical information: This information included age, sex, body mass index(BMI), symptom status (New York Heart Association (NYHA) classification), previous cardiac history (previous myocardial infarction and previous percutaneous coronary intervention (PCI)), diabetes, hypertension, hyperlipidaemia, peripheral vascular disease, previous stroke or chronic obstructive pulmonary disease, smoking, baseline renal function (eGFR), left ventricular ejection fraction (LVEF), anaemia, , proteinuria and preoperative IABP implantation. The information recorded during the operation included the presence of left main disease, ≥3 coronary artery lesions, ≥3 coronary anastomoses, operation time, on-pump CABG, and emergency surgery. Postoperative information included the use of blood products, ventilator time, ICU stay time. Related information about surgical complications (death, reoperation, perioperative myocardial infarction, respiratory complications, atrial fibrillation, stroke) was also included.