Successful ablation of ventricular tachycardia after correction of tetralogy of Fallot

We present a case of a patient who, after correction of tetralogy of Fallot (TOF), experienced runs of ventricular tachycardia (VT). Mapping of the aortic root showed that the critical component of the reentry was located within the noncoronary cusp. The potential explanations of such an unusual isthmus location may be the presence of myocardial extensions in the aortic root or the close vicinity of the right ventricle (RV) to the noncoronary cusp, since in TOF the aorta overrides the RV. Our case highlights the advantage of using electroanatomic mapping systems together with intracardiac echocardiography in such complex cases.