NPPB and heart failure: Stratified variables in relation to adverse events, indicting the combined effect of the sST and the β-blocker on adverse events, were consistent across different subgroups, including gender (p for interaction = 0.5380), previous history of heart failure (p for interaction = 0.8702), septal thickness (p for interaction = 0.7741), urea (p for interaction = 0.8019), and BNP (p for interaction = 0.8914).