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. 2017 Sep 15;50(1):1–55. doi: 10.1007/s10840-017-0277-z

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 5 — Schematic drawing showing mechanisms of atrial flutter and atrial tachycardia. a Isthmus-dependent reverse common (clockwise) atrial flutter. b Isthmus-dependent common (counter clockwise) atrial flutter. c Focal atrial tachycardia with circumferential spread of activation of the atria (can arise from multiple sites within the left and right atrium). d Microreentrant atrial tachycardia with circumferential spread of activation of the atria. e Perimitral atrial flutter. f Roof-dependent atrial flutter