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Figure 2 Correlation of platelet activation with index events and treatments. The relationship between platelet activation at baseline and dose of ADP are shown for each index event in the upper panel, and for each primary therapy in the lower panel. Platelet activation differed significantly by index event (p < 0.001) with highest activation seen in Q-wave MI patients and lowest activation seen in unstable angina patients. Platelet activation was also higher in subjects receiving thrombolysis or primary PTCA as therapy, compared to subjects receiving neither (p < 0.001). The number of patients in each group is shown in parentheses.