Radiofrequency ablation of the slow pathway abolished tachycardia with no recurrence at 3-month follow-up in a patient with repaired Tetralogy of Fallot.
Case Report (n=1)
No
Invasive electrophysiology study with careful His bundle mapping can accurately diagnose rare 2-for-1 AV nodal conduction, which can be effectively treated with slow pathway ablation even in patients with repaired congenital heart disease.
2-for-1 atrio-ventricular (AV) nodal conduction, also known as Dual AV nodal Non-Reentrant Tachycardia (DAVNNT) or Double Ventricular Response Tachycardia (DVR), is an uncommon arrhythmia in which a single atrial impulse conducts simultaneously via both fast and slow AV nodal pathways, producing two ventricular activations 1. Misdiagnosis is frequent because of its variable surface ECG appearance2. We report a case of 2-for-1 tachycardia in a patient with repaired TOF, highlighting diagnostic maneuvers and successful ablation.
Nallathambi et al. (Sun,) conducted a case report in Supraventricular tachycardia due to 2-for-1 atrioventricular nodal conduction in patient with repaired Tetralogy of Fallot (n=1). Radiofrequency ablation of the slow pathway was evaluated on Elimination of tachycardia and recurrence of symptoms. Radiofrequency ablation of the slow pathway abolished tachycardia with no recurrence at 3-month follow-up in a patient with repaired Tetralogy of Fallot.