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Figure 3 Examples of left ventricular (LV) endocardial activation maps during left bundle branch block (LBBB) and pacing at various LV sites and excitation time difference between LV and RV (TVVs) smaller than, equal to, and larger than zero. Also presented is an example of LV endocardial activation during right ventricular (RV) pacing at a short AV delay. The black arrows denote the activation delay vectors, the amplitude of which reflects the degree of intra-ventricular asynchrony.