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. 2018 Apr 18;12:1179546818771700. doi: 10.1177/1179546818771700

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© The Author(s) 2018

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — (A) Twelve-lead electrocardiography before treatment showing regular narrow QRS tachycardia with a heart rate of 203 bpm. Lead II does not have an isoelectric baseline and indicates atrial flutter with 2:1 atrioventricular conduction. (B) Electrocardiogram (II, III, aV_F-lead) after adenosine triphosphate infusion revealing atrial flutter with an F rate of about 400 bpm (2:1 atrioventricular conduction).