A New Mechanistic Insight Into Macro‐Reentrant Atrial Tachycardia in a Patient With Modified Fontan Circulation

Fontan flutter: an unusual example of an atrial tachycardia circuit in a patient with atrio-pulmonary connection (APC) conduit. The tachycardia circuit propagates around the base of the conduit (encircled by the arrows, showing direction of propagation from earliest [red] to latest [purple]). Radiofrequency ablation was delivered (red dots) and tachycardia terminated on ablation at the green arrow.