NPPB and atrial fibrillation: We found that not having had percutaneous coronary intervention (PCI), NT-proBNP levels >2,122 ng/L, a left ventricular mass index >137.9 g/m2, renal insufficiency, age >76.5 years, NYHA grade IV, and atrial fibrillation were risk factors for death in patients with HFrEF.