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Figure 3 Comparison of myocardial blood flow in the left anterior descending coronary artery zone at the 30 µg·kg^–1·min^–1 dobutamine infusion. Note that endocardial, midwall and transmural blood flows in dogs with larger infarct size (group 2) were significantly lower than values in dogs with a smaller infarct size (group 1). Endocardial flow in group 2 failed to increase from baseline at peak dobutamine infusion. *p < 0.05 vs. group 1; p < 0.01 vs. group 1.