Postoperative urinary NGAL>50 ng/mL: RL group: 32%, HES group 21% (NS) >25 ng/mL: RL group: 47%, HES group: 32% (NS)Early postoperative AKI: RL group: 26%, HES group: 21% (NS). The gene discussed is LCN2; the disease is acute kidney injury.