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Figure 1 Examples of (A) left ventricular (LV) endocardial activation maps with the activation delay vector indicated by arrows, (B) electrocardiographic tracings, (C) right ventricular (RV) and LV pressure signals, and (D) pressure–volume loops, before and after creation of left bundle branch block. In (B), the earliest and latest LV endocardial activation are indicated by dotted lines. In (C), right ventricular (RV) and LV pressures are normalized to reveal timing differences. The LV endocardial activation maps are presented as bull's-eye plots, with the inner disc representing the LV apex and the outer circle disc representing the LV base (S, A, L, and P indicate the septum and anterior, lateral, and posterior walls, respectively).
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