ALB and acute kidney injury: After adjusting for age ≥75 years, sex, CKD, AMI, PCI, CHF, hypertension, diabetes mellitus, anemia, contrast media volume, and albumin, multivariate Cox regression analysis revealed that compared with no CA-AKI group, non-recovered CA-AKI group was significantly associated with increased mortality [adjusted hazard ratio (HR): 1.39, 95% confidence interval (CI):1.21–1.60, p < 0.001], while the recovered CA-AKI group was not (adjusted HR: 1.06, 95% CI: 0.81–1.39, p = 0.661) (Figure 3).