Abstract
A 40-year-old man with a history of tetralogy of Fallot and multiple cardiac surgeries presented for mapping and ablation of an incessant atrial tachyarrhythmia. Activation and entrainment mapping in conjunction with an electroanatomic mapping system defined the mechanism of the tachycardia as a dual-loop incisional reentry atrial flutter around previous atriotomy scars in the lateral right atrium. A line of ablation lesions transecting the critical isthmus of both loops of the dual-loop circuit successfully terminated the atrial flutter.
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