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. 2020 Jan 15;10:305. doi: 10.1038/s41598-019-57246-5

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Effects of amiodarone (Ami), digoxin (Digo), disopyramide (Diso) and quinidine (Quin) on action potential (AP) and the heart rate in sinus node dysfunction (SND). (A) AP, (B) MDP, (C) DDR₁₀₀, (D) OS, (E) (dV/dt)_max, (F) Cai_max, (G) Cai_max and (H) heart rate under the SND condition (SND/Wout) are compared with SND in the presence of amiodarone (SND/Ami), digoxin (SND/Digo), disopyramide (SND/Diso) and quinidine (SND/Quin), respectively.