Abstract
We investigated 49 children with ventricular tachycardia (VT) without structural heart disease. There was no significant difference in heart rate during VT between sustained and non-sustained VT. In the group with significant symptoms, sustained type was more frequently seen than non-sustained type (p<0.003). The site of origin of VT was as follows, right ventricle in 65% and left ventricle in 35%. In the group with significant symptoms, VT originated more often in the left ventricle than in the right ventricle (p<0.002). Catheter ablation and cryosurgical ablation were very effective for cases with no good response to any antiarrhythmic drugs. Four of 49 cases (8.2%) had died suddenly. Three of them had syncopal episodes, and during the treadmill testing, polymorphic or bidirectional VT was provocated. These findings suggested that the prognosis of the patient with exercise-induced, multifocal, polymorphic and bidirectional VT was poor. In cases with no satisfactory response to medical therapy, catheter ablation and cryosurgical ablation should be considered.
