NPPB and atrial fibrillation: Shibazaki et al. have stated that a cut-off BNP level of 140 pg/mL could be used to identify cardiogenic embolism with a sensitivity of 80.5% and a specificity of 80.5%.5) Reportedly, BNP-65 pg/mL was independently associated with covert AF and the detection rate of new-onset AF increased with the BNP level.6) BNP measurements are considered to require some correction for age because they correlate positively with age.