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Figure 4 Electrograms of PAP-PVCs

(A) The 12-lead electrocardiogram of PVCs originating in the same posteromedial papillary muscle shown in Figures 1 and 2. (B) Local electrogram at the site of PVC origin in the posteromedial papillary muscle. The endocardial activation time is –38 ms. Note that the sinus rhythm electrogram at this site is fractionated and broad, extending beyond the end of the QRS complex. Abbreviations as in Figure 1.