A total of 11 reports analyzed cardiac involvement in 319 patients without KD; 8% (N = 28) had abnormal echocardiograms, 3% (N = 11) pericarditis or pericardial effusion, 2.5% (N = 8) myocarditis, 2% (N = 7) ventricular dysfunction, 4% (N = 13) coronary aneurysm/dilatation/abnormality, without valvular dysfunction or abnormal ECG, 1.6% (N = 5) had elevated BNP levels and 1.2% (N = 4) had elevated troponin levels (Supplementary Table 7). Here, NPPB is linked to myocarditis.