Figure 1: Histogram of ejection fractions in the patient population (a) Exercise stress patients. (b) Dipyridamole stress patients. (c) Dobutamine stress patients. Next to each panel is the mean SD for the LVEF. CAD: coronary artery disease; CI: cardiac Index; DC: dilated ischemic cardiomyopathy; DCM: idiopathic dilated cardiomyopathy; DIP: dipyridamole; DOB: dobutamine; : arterial elastance index; : LV end-systolic elastance index; : ventricular-arterial coupling ratio; EX: exercise; HYP: hypertensives; NL: normals; PVA: pressure-volume area; SVR: systemic vascular resistance; and TEST: diagnostic tests.