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. 2020 Dec 16;48(12):0300060520977634. doi: 10.1177/0300060520977634

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© The Author(s) 2020

Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://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 2. — An example of a notched unipolar electrogram (UEGM) and a deduction of its mechanism. The notches in the unipolar electrogram represent local myocardial activation at the breakthrough of the premature ventricular contraction, depolarization of the ventricular outflow tract (VOT) and far field ventricular potential, respectively. BEGM1, distal bipolar electrogram; BEGM2, proximal bipolar electrogram.