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Figure 2 (A) Diltiazem and (B) nitroglycerin caused dose-dependent reductions in MVO₂ in failing human hearts. There was no difference in the response of the LVAD (solid circles) and HF (open circles) groups to diltiazem or nitroglycerin. *p < 0.05 from baseline. HF = heart failure; LVAD = left ventricular assist device; MVO₂ = myocardial oxygen consumption.