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Figure 5 Distribution of regional cycle efficiency within the LV. Regional cycle efficiency was higher for the most apical and basal volume segment at each pacing site in patients with EF <40% (top) and EF  40% (bottom). Regional cycle efficiency depended on pacing site and varied by region within pacing site in the group with EF <40% (top), but not the group with EF 40% (bottom). In general, RVA pacing attenuated the apical segmental synchrony, and RVFW and RVS pacing attenuated the basal segmental synchrony in the with EF 40% group. Data are mean ± SE (2-way RM ANOVA Student-Neuman-Keuls comparison). Abbreviations as in Figures 1 and 2.
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