With the multivariate analysis, emergency OPCAB, the preoperative albumin, and the NL ratio were identified as independent predictors of AKI (emergency OPCAB: odds ratio (OR): 3.06, 95% confidence interval (CI): 1.45–6.41, P = 0.004; the preoperative albumin: OR: 0.47, 95% CI: 0.28–0.79, P = 0.004; the NL ratio: OR: 1.08, 95% CI: 1.02–1.15, P = 0.007, Table 4). Here, ALB is linked to acute kidney injury.