Junjie Zhang et al. JACEP 2017;j.jacep

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Date of download: 6/18/2016 Copyright © The American College of Cardiology. All rights reserved. From: The V2 Transition Ratio: A New Electrocardiographic.

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Junjie Zhang et al. JACEP 2017;j.jacep.2016.12.017 The EP Substrate in Relation to PVCs (A) Epicardial J-wave magnitude and (B) ARI maps during SR. (C) Premature ventricular contraction (PVC) activation map and 12-lead electrocardiogram (ECG). Each panel shows maps for 2 patients, ER-1 (left, PVC coupling interval = 635 ms) and ER-11 (right, PVC coupling interval = 520 ms). The hearts are displayed in anterior and lateral views. White arrows in B point to regions with steep ARI gradients. In C, J-wave EGMs from the PVC site of origin are shown (black arrow); 12-lead ECG depicting the PVC is shown to the right of the map. The PVC initiation sites are indicated by plus signs (+). Note that an electrophysiological (EP) substrate with abnormal EGMs, shortened ARIs, and steep ARI gradients correlated with the PVC site of origin in both cases. Abbreviations as in Figures 1 to 4. Junjie Zhang et al. JACEP 2017;j.jacep.2016.12.017 American College of Cardiology Foundation