NPPB and ischemia: Correspondingly, the multivariable regression model, adjusted for the same variables, revealed that only a BNP plasma concentration (OR = 1.16, 95% CI = 1.058–1.278, p = 0.002) and chronic CAD (OR = 23.42, 95% CI = 1.028–533.547, p = 0.048) represented risk factors for ischemia in the HFrEF subgroup.