NPPB and delirium: That study highlighted that the increased risk was particularly high for 30‐day compared with 90‐day readmissions, and patients with delirium had an increased heart rate, increased brain natriuretic peptide, increased rales in the lung base, and a higher prevalence of impaired LV systolic function, which is in line with the idea that inflammation, stress, neurohormonal dysregulation, as well as periodic or sustained hypoxia during surgery are key factors in delirium pathogenesis.31, 32, 33