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Figure 5.25. PVC onset and initiation sites of an ARVC patient with a high PVC burden (18.69%).
A. Time-course of observed PVCs in relation to exercise and schematic map of PVC initiation
sites. The different PVC initiation sites are labeled A, B, C and color-coded. PVC occurred only
after onset of exercise and morphology C appeared only once near peak heart rate. B. Activation
isochrones maps of the 3 distinct PVC morphologies observed in this patient. Asterisks indicate
PVC initiation sites. Morphology B showed a broad region of early epicardial activation, indicating
a possible subepicardial origin and possible conduction system involvement. AT: activation time.
From Andrews et. al. [323] with permission of Wolters Kluwer Health, Inc.