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Figure 3 Example of echocardiographic and scintigraphic images obtained in a patient without collaterals (group B) at baseline, during low dose dobutamine infusion and after revascularization (POST-REV) (image composed as in Fig. 2). The decrease in left ventricular end-systolic dimensions at both dobutamine and postrevascularization echocardiographic studies in comparison with the basal study is visible. Differently from the patient shown in Figure 2 (a patient with collaterals), no change in ^99mTc-Sestamibi uptake in the infarcted area is visible at dobutamine scan in comparison with basal scan. A significant increase in tracer uptake was nevertheless detected after revascularization.