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Figure 1 Measurements of the electro-mechanical delaypeak of the basal portion of the septal and lateral walls before the implantation, in simultaneous biventricular pacing (BVP), and in optimized sequential BVP (pre-activation of the left ventricular [LV] lead of 20 ms). Important delay (110 ms) between the two segments in spontaneous rhythm, reduction of this delay (50 ms) in simultaneous BVP, and further improvement (0 ms) in optimized sequential BVP.