NPPB and Kawasaki disease: It has also been reported that the level of NT-proBNP in infants (2442 ± 1866 pg/mL) is significantly higher than that in children (945 ± 1151 pg/mL) [42], so a high level of serum NT-proBNP concentration when children are over 3 years old is more valuable for predicting coronary artery injury in Kawasaki disease.