NPPB and chronic kidney disease: For long-term mortality (Table 4), significant independent predictors included mFI ≥ 0.273 (HR 6.45; p < 0.001), preoperative chronic kidney disease (HR 3.25; p = 0.023), and HFpEF with NT-proBNP > 1000 pg/mL (HR 5.33; p < 0.001).