Definition of AKI
AKI was defined according to the Kidney Disease Improving Global
Outcomes (KDIGO) criteria18: an increase in serum
creatinine (Scr ≥ 0.3mg/dl) or an increase in Scr ≥1.5times baseline in
7 days after surgery or urine volume ≤ 0.5ml/kg/h for 6h.