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Figure 6 Typical example of the relationship between changes in left ventricular (LV) maximum rate of increase in pressure (dP/dtmax) and inter-ventricular asynchrony (interVA) (A) and intra-ventricular asynchrony (intraVA) (B) during LV apex, LV lateral wall, and biventricular (BiV) pacing with atrioventricular (AV) delays ranging from 20 to 200 ms. The dotted arrows indicate shortening of the AV delay. Data points most remote from baseline left bundle branch block (LBBB) denote the shortest AV delay (20 ms); subsequent points were obtained at a 10-ms increase, except for intraVA. The sign given to intraVA values indicates the direction of the wave front, as indicated above the graphs. The results for anterior and posterior wall pacing were comparable to those for lateral wall pacing.
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