Catheter ablation for right ventricular outflow tract ventricular tachycardia induced by fever in a 7-year-old girl.

We report a 7-year old girl with ventricular tachycardia exacerbated by fever. She experienced her first symptom of palpitations during an influenza infection, and electrocardiogram showed wide QRS tachycardia of a left bundle branch block inferior axis pattern. We performed an electrophysiological study (EPS) for diagnosis, but the wide QRS tachycardia could not be induced. The wide QRS tachycardia recurred during upper respiratory tract infection with fever and ceased with lidocaine administration. Wide QRS tachycardia is characteristic of ventricular tachycardia (VT) exacerbated by fever. VT was not able to be induced at a normal temperature on EPS; however, when her temperature exceeded 38 degrees C, VT was easily induced and was accompanied by decreased blood pressure. Radiofrequency catheter ablation was performed in the right ventricular outflow tract (RVOT) just under the pulmonic valve, with a fractionated potential 29 ms before onset of V1 QRS. VT was terminated approximately 4 s after RF application, and then VT could not be induced with or without high fever. This is the first report of successful ablation treatment in RVOT VT exacerbated by fever in a young child.