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Figure 4 Pressure–volume loops measured with the conductance catheter, showing the short-term effect of pacing during left bundle branch block (LBBB) for left ventricular (LV) apex (left panel) and LV lateral pacing (right panel) at paced atrioventricular delays of 40 and 90 ms. The results for anterior and posterior wall pacing were comparable to those for lateral wall pacing.