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. 2018 Sep 18;5:123. doi: 10.3389/fcvm.2018.00123

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Copyright © 2018 Cheniti, Vlachos, Meo, Puyo, Thompson, Denis, Duchateau, Takigawa, Martin, Frontera, Kitamura, Lam, Bourier, Klotz, Derval, Sacher, Jais, Dubois, Hocini and Haissaguerre.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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12 lead ECG (Left) with associated endocardial tracings (Right) showing spontaneous polymorphic PVCs from a patient with idiopathic VF. A wide PVC likely originating from the right ventricle is followed by a concealed retrograde Purkinje potential (red star). Purkinje potentials during sinus rhythm are shown by blue arrows. PVCs originating from the Purkinje fibers are preceded by Purkinje potentials with a different coupling interval (red arrows). Notice the modifications in PVC morphology which result from the complex arborization of the left Purkinje system.