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The spread of electrical activation was simulated in intrinsic LBBB, pacing at the RV apex at anterior (RVAP-A), middle (RVAP-M) and posterior (RVAP-P) sites, and pacing at the mid wall of the RV septum (RVSP). The latest activation regions (black circles) are shown on the 16 segment American Heart Association models of the activation across the LV epicardium and endocardium
