We report the case of a patient with recurrent episodes of postoperative intra-atrial reentrant tachycardia occurring after surgical patch closure of a sinus venosus atrial septal defect (SVASD). Arrhythmic episodes, as usually reported in scar-related arrhythmias, were resistant to antiarrhythmic therapy and worsened patient's quality of life. Therefore, we decided to perform an intracardiac electrophysiology study using a 3D-high definition mapping system to identify and treat the precise arrhythmic substrate with radiofrequency ablation. There is a growing evidence that this technique represents a valid therapeutic option in postoperative arrhythmias refractory to medical treatment in patients with repaired congenital heart disease.
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