Catheter ablation of atrial fibrillation may predispose patients to the development of atypical atrial flutters (AFL). We describe two cases of roof dependent AFLs that failed to terminate despite posterior wall isolation. An epicardial breakthrough involving the septopulmonary bundle is proposed. The correlation between the electrophysiological findings and the anatomical substrate is described.
Keywords: atrial fibrillation; atypical flutter; catheter ablation; septopulmonary bundle.
© 2019 Wiley Periodicals, Inc.