Conclusion In our case both contrast-enhanced computed tomography and electroanatomical mapping system were used for guiding the procedure. Voltage mapping demonstrated a large scar area adjacent to the baffle. Fragmented and double potentials were recorded, indicating slow conduction zones. To achieve CTI block application of the RF energy from the both sides of the baffle was used. Our case demonstrates RF ablation of CTI is a safe and effective therapeutic modality of drug refractory atrial

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... lutters in patients with Senning operation. References 1. Kanter RJ. Pearls for ablation in congenital heart disease. J Cardiovasc Electrophysiol 2010; 21: 223-30. [CrossRef] 2. Kanter RJ, Papagiannis J, Carboni MP, Ungerleider RM, Sanders WE, Wharton JM. Radiofrequency catheter ablation of supraventricular tachycardia substrates after Mustard and Senning operations for d-transposition of the great arteries. J Am Coll Cardiol 2000; 35: 428-41. [CrossRef] 3. Dong J, Zrenner B, Schreieck J, Schmitt C. Necessity for biatrial ablation to achieve birectional cavotricuspid isthmus conduction block in a patient following Senning operation. J Cardiovasc Electrophysiol 2004; 15: 945-9. [CrossRef] 4. Perry JC, Boramanand NK, Ing FF. "Transseptal" technique through atrial baffles for 3-dimensional mapping and ablation of atrial tachycardia in patients with d-transposition of the great arteries.