latent high risk heart diseases , detected among presumably healthy school children by the heart disease screening program , were the following : hypertrophic cardiomyopathy , long qt syndrome , kawasaki disease and some arrhythmias ( ventricular tachycardia , sick sinus syndrome , a-v block and atrial fibrillation ) .
C0003811
arrhythmias
C0004238
atrial fibrillation