Monitoring Antiplatelet Therapy

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Abstract
Platelet function tests measure different aspects of platelet function, which include adherence, activation, aggregation and secretion. Clinically, the goal of platelet function testing is to provide information about the platelet contribution to the risk of thrombotic or haemorrhagic events and the optimisation of antiplatelet therapy. The important clinical questions are whether an antiplatelet agent is having the desired effect on platelet inhibition (effectiveness) and whether the patient has sufficient residual platelet function to avoid bleeding (safety). The role of aspirin (acetylsalicylic acid) and thienopyridines is well established in the management of patients with coronary artery disease and in the setting of coronary interventions. The last several years have demonstrated the unequivocal effectiveness of intravenously administered platelet glycoprotein (GP) IIb/IIIa antagonists in the management of acute coronary syndromes and in the setting of percutaneous coronary interventions. With the increasing use of these GPIIb/IIIa antagonists, it is becoming more important clinically to measure platelet inhibition with these agents. This paper reviews major techniques and instrumentation for platelet monitoring and discusses the goals of the best method.

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