NPPB and diabetes mellitus: The 10 most frequently occurring predictor variables in this review were as follows (Figure 3): LVEF (14/23), age (12/23), Killip classification (8/23), diabetes (7/23), Cr/eGFR (7/23), BNP/NT-proBNP (6/23), gender (5/23), cTnI (5/23), smoking (4/23), hypertension (4/23), and CRP/hs-CRP (4/23).