Biatrial flutter circuit involving an anomalous insertion of the Bachmann bundle into the superior vena cava

Atypical atrial flutters with clockwise mitral activation usually originate in the left atrium (LA). However, in patients with prior linear ablation for atrial fibrillation (AF), this can be misleading. A 62-year-old female who underwent 3 prior AF ablations, presents for ablation of recurrent