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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(A) Twelve-lead ECG of patient with ventricular bigeminism. (B) Twelve-lead ECG of the same patient one hour after taking a flecainide tablet. ECG: electrocardiogram.