Predicting the Need for Infliximab in Kawasaki Disease Using N-Terminal Pro-Brain Natriuretic Peptide at Diagnosis.

We retrospectively reviewed 895 patients with Kawasaki disease treated at two Japanese pediatric centers between 2015 and 2024 to assess whether N-terminal pro-brain natriuretic peptide (NT-pro BNP) levels at diagnosis can predict the need for infliximab (IFX) therapy. Patients were divided into (1) the IFX group (n = 35), including patients who received IFX as third-line therapy due to resistance to first- and second-line treatments, including intravenous immunoglobulin, and (2) the non-IFX group (n = 860), including patients who responded to initial therapies. Clinical and laboratory variables were compared between the groups, and predictors of IFX use were analyzed using multivariate logistic regression and receiver operating characteristic (ROC) curves. Multivariate analysis comparing the IFX and non-IFX groups identified older age, lower hemoglobin levels, and higher NT-pro BNP Z-score at diagnosis as independent predictors of later IFX requirement. Additionally, the incidence of coronary arterial lesions did not differ significantly between the groups. ROC analysis demonstrated NT-pro BNP Z-score as a significant predictor (AUC 0.66, p < 0.001), with a cutoff of 2.2 yielding 71.4% sensitivity, 63.3% specificity, 7.3% positive predictive value, and 98.2% negative predictive value. Elevated serum NT-pro BNP Z-score at diagnosis was associated with later IFX use, whereas a low Z-score reliably identified patients unlikely to require IFX. Early assessment incorporating NT-pro BNP may optimize Kawasaki disease therapy and guide the appropriate timing of IFX administration.