It is known that tachyarrhythmias in patients with congenital heart defects have a potentially high impact on quality of life, morbidity and mortality. Conventional treatment with antiarrhythmic drugs may have untoward results including recurrence of tachyarrhythmia and its adverse effects. Therefore, radiofrequency catheter ablation is increasingly used for the treatment of supraventricular tachycardias in patients with congenital heart diseases, although abnormal anatomy and atypical conduction systems have the potential to complicate catheter ablation procedures. This report describes our experience with the successful radiofrequency catheter ablation of atrio-ventricular nodal reentrant tachycardia (AVNRT) in a patient with dextrocardia with situs solitus (isolated dextrocardia).