Atrial tachycardia ablation at the pulmonary outflow tract in a patient with congenitally corrected transposition of the great arteries

Key Teaching Points•Congenitally corrected transposition of the great arteries (ccTGA) is a rare congenital heart disease, and computed tomography (CT) or cardiac magnetic resonance image is very useful to construct the true anatomical position relationship in patients.•Atrial tachycardia (AT) in patients with ccTGA is relatively rare, and its ablation is difficult because of the reversed anatomical locations. It is very important with comprehensive activated mapping in the entire left and right atria and the adjacent structure (such as the pulmonic outflow tract) to find the earliest activation site for AT.•Real-time intracardiac echocardiography images combined with CT or cardiac magnetic resonance imaging is very useful to guide the activated mapping during radiofrequency ablation. •Congenitally corrected transposition of the great arteries (ccTGA) is a rare congenital heart disease, and computed tomography (CT) or cardiac magnetic resonance image is very useful to construct the true anatomical position relationship in patients.•Atrial tachycardia (AT) in patients with ccTGA is relatively rare, and its ablation is difficult because of the reversed anatomical locations. It is very important with comprehensive activated mapping in the entire left and right atria and the adjacent structure (such as the pulmonic outflow tract) to find the earliest activation site for AT.•Real-time intracardiac echocardiography images combined with CT or cardiac magnetic resonance imaging is very useful to guide the activated mapping during radiofrequency ablation.