e0458 Comparative study of aspirin and clopidogrel in high risk ACS

Background It is not reasonable to administrate the same dosage of antiplatelet medicine to all patients with ACS regardless of patients’ height, weight, metabolism and effectiveness of those medicines. And thromboelastography (TEG) has provided a relatively stable, convenient, duplicable method for testing activity of platelet in recent years. Objective To investigate the inhibition levels and characteristics of frequency distributions of platelet aggregation after antiplatelet therapy with aspirin and clopidogrel in Chinese patients with ACS undergoing PCI. Methods High risk Patients with ACS received PCI after administration of loading dosage of clopidogrel (600 mg) and aspirin (300 mg) subsequence with maintenance dose of clopidogrel (75 mg per day) and aspirin (100 mg per day) for one year. Blood sample was gotten 24–48 h after PCI for the test of TEG-mapping in order to detect the residual activities of platelet induced by thrombin AA or ADP. And then the inhibition ratios of platelet after therapy were calculated and the characteristics of their distribution were analysed. Results 1) The maximal potential activities of platelet are not homogeneous. Among the patients enrolled in this study, 7.1% is in very low activity while 14.3% is in very high. 2) The inhibition on aggregation of platelet also differs in ADP pathway and AA pathway. The frequency fractional of aspirin is more lower when the inhibition rate is under 30% and more higher when it is between 70%–79.9% (p