The median peak NT-proBNP level in the group with fulminant myocarditis was 32,000 pg/mL (IQR: 25,000–42,000), being significantly higher than that of the non-fulminant myocarditis group (2100 pg/mL [IQR: 100–5600]) (p < 0.001). The gene discussed is NPPB; the disease is myocarditis.