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. 2021 Sep 23;8:741377. doi: 10.3389/fcvm.2021.741377

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Copyright © 2021 Chou, Chung, Chang, Lin, Lo, Hu, Chao, Liao, Tuan, Lin, Chang, Liu, Wu, Huang, Chen, Cheng, Liu, Lugtu, Jain, Feng, Chang and Chen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Activation map during AFL in a patient with typical AFL. The activation wave front travels through cavotricuspid isthmus and goes around the tricuspid annulus. (B) Activation map during atypical atrial flutter in a patient with atypical AFL. The activation wave front goes around the surgical scar located at the right posterior free wall. AFL, atrial flutter.