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Figure 6 Variations of a and b parameters during each protocol phase: b = baseline, o = occlusion, r30, r60, r120, r180 = reperfusion 30, 60, 120 and 180 min. the evolution of the parameters differs for two subgroups defined by their infarct area sizes (*p < 0.01 for comparison for each group between basal and occlusion/reperfusion stages). MCE = myocardial contrast echocardiography.