ALB and acute kidney injury: In the non-AKI group, urinary albumin levels significantly increased post-operation (P < 0.01), 4-h post-operation (P < 0.01) and on PODs 1 (P < 0.01), 2 (P < 0.05) and 3 (P < 0.01) compared with those pre-operation (Fig. 1).