Percutaneous Catheter Ablation of Malignant, Recurrent Ventricular Arrhythmia in a 10-Month-old Toddler.

Key Teaching Points•Percutaneous ventricular tachycardia ablation under 1 year of age is feasible.•It is technically difficult because of the mismatch between the size of the catheters and the size of the heart.•The cause of sudden death at this age may be ventricular arrhythmias. •Percutaneous ventricular tachycardia ablation under 1 year of age is feasible.•It is technically difficult because of the mismatch between the size of the catheters and the size of the heart.•The cause of sudden death at this age may be ventricular arrhythmias.