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Percent change from DYSS in QRS duration (A), maximum dP/dt (B), EF (C), and minimum dP/dt (D) during ENDO and EPI biventricular pacing (BVP) at various pacing sites of LV activation (EARLY, MID, and LATE) during ENDO and EPI BVP. Responses are shown for both nonfailing hearts (left) and failing hearts (right). *P < 0.05, ENDO vs. EPI. †P < 0.05, ENDO, LATE vs. EARLY. ‡P < 0.05, ENDO, MID vs. EARLY.
