Catheter ablation of manifest posteroseptal accessory pathway associated with coronary sinus diverticula in a child with congenitally corrected transposition of the great arteries

Patients with congenitally corrected transposition of the great arteries (ccTGA) usually have some specific electrophysiological features, such as twin AV node and accessory pathway (AP)-related supraventricular tachycardia (SVT) (1-3). There is limited number of AP-related case presentations of patients with both ccTGA and Wolff–Parkinson–White (WPW) syndrome (3, 4). Some of the posteroseptal pathways are related to coronary sinus (CS) diverticula, and these pathways are close to the epicardium. Therefore, multiple ablation entries can cause ablation failure (4, 5). Till date, there has been no report of ccTGA accompanied with WPW syndrome treated by an ablation from inside the CS diverticula in pediatric patients. Here we present a successful radiofrequency (RF) ablation of the CS diverticula-related manifest posteroseptal AP in a pediatric patient with ccTGA.