In the case of hemodynamically stable broad complex tachycardia, it is essential to evaluate the causes and to diagnose correctly in the selection of appropriate management and drugs. We report two neonates diagnosed with idiopathic ventricular tachycardia, which is extraordinarily rare. One presented with idiopathic fascicular ventricular tachycardia (right bundle branch block pattern with a superior axis), and the other presented with right ventricular outflow tract ventricular tachycardia (left bundle branch block pattern with an inferior axis). These two forms are representative of benign ventricular tachycardia. No features of cardiovascular shock were observed. While the recommended initial drug treatments are different, the conditions were well controlled by propranolol without the development of any adverse events. There was no recurrence of arrhythmia for several months in the outpatient clinic.

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