Moreover , after PCI , 61 % of patients allocated to aspirin reload and only 32 % of patients allocated to control group reached normal microcirculatory reperfusion ( myocardial blush grade = 3 ) ; patients with myocardial blush grade = 3 exhibited lower values of serum thromboxane B2 compared with those with myocardial blush grade < 3 ( P = 0.05 ) .