Diagnosis of Postoperative Acute Kidney Injury

The diagnosis of postoperative AKI stage 3 was based on the Kidney Disease: Improving Global Outcomes (KDIGO) criteria (12 (link)): a threefold increase or more above baseline or an increase in serum creatinine (sCr) to ≥ 4.0 mg/dl (≥ 353.6 mmol/l) or the initiation of renal replacement therapy (RRT) or, in patients under 18 years of age, a decrease in estimated glomerular filtration rate (eGFR) to <35 ml/min per 1.73 m² (Table 1). The diagnosis of ATAAD was confirmed by a contrast-enhanced computed tomography (CT) scan, with the onset of symptoms onset within 48 h. Intraoperative bleeding was defined as blood loss that was collected and quantified using intraoperative cell salvage and surgical gauze swabs. Continuous RRT was defined as the need for continuous hemofiltration or hemodialysis after surgery.