Additionally, diuretic (OR = 3.681, 95% CI: 1.372–9.879, p = 0.010), NT-ProBNP (OR = 2.090, 95% CI: 1.204–3.628, p = 0.009), anemia (OR = 3.426, 95% CI: 1.523–7.703, p = 0.003), and reduced LVEF (OR = 1.077, 95% CI: 1.006–1.153, p = 0.033) were identified as independent risk factors for CIAKI following PCI, as shown in Table 6. This evidence concerns the gene NPPB and anemia (phenotype).