ABSTRACT
Twenty four hours ambulatory monitoring of electrocardiogram and exercise stress testing were performed in 60 children who were refered to our hospital because of isolated premature ventricular contractions (PVCs) .<BR>Complex ventricular ectopy was found in 28 out of 60 PVC children. Out of 28 subjects with complex ventricular ectopies 21 had PVCs originated from the right ventricle.<BR>Frequency of PVCs per day was high in primary ventricular tachycardia and low in ventricular tachycardia with organic heart disease and there was statistical significance (p<0.01) between these two groups.<BR>There was no characteristics in coupling interval, prematurity index and vulnerability index which could specify ventricular tachycardia, couplets PVCs and isolated PVC.<BR>VT rate in exercise stress testing was higher than that in twenty four hours ambulatory monitoring of electrocardiogram (Holter recording) . Both exercise stress testing and twenty four hours monitering of electrocardiogram should be done to control VT school children.