Figure 2. (Upper) Changes in end-diastolic volume (EDV) (induced by raising the legs) are plotted against corresponding changes in stroke volume for each patient in Group A (open icons) and Group B (filled icons) at time 0 and time 10. At time 10, similar increases in EDV induced greater increases in stroke volume, suggesting enhanced contractile function. (Lower) Changes in EDV (induced by raising the legs) are plotted against corresponding changes in end-diastolic pressure (EDP) for each patient in Group A (open icons) and Group B (filled icons) at time 0 and time 10. At time 10, similar increases in EDV induced lower increases in EDP, suggesting enhanced ventricular compliance.