alexa The use of the VerifyNow system to monitor antiplatelet therapy: a review of the current evidence.
Haematology

Haematology

Journal of Blood Disorders & Transfusion

Author(s): van Werkum JW, Harmsze AM, Elsenberg EH, Bouman HJ, ten Berg JM, , van Werkum JW, Harmsze AM, Elsenberg EH, Bouman HJ, ten Berg JM,

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Abstract Multiple studies have demonstrated the effectiveness of dual or triple antiplatelet therapy with aspirin, clopidogrel and glycoprotein (GP) IIb/IIIa therapy in patients with acute coronary syndromes as well as in patients undergoing coronary stent implantation. In the last few years, it is becoming clear that not all patients receive the full benefits with the current standard dosages of antiplatelet therapy. Specifically, numerous studies have revealed a wide interindividual variability in the response to these antiplatelet agents and, more importantly, both nonresponsiveness as well as a heightened residual platelet reactivity have been linked to the occurrence of adverse cardiovascular events. Therefore, assays that identify those patients with an impaired responsiveness or a heightened platelet reactivity despite dual antiplatelet therapy may contribute to better risk stratification and will probably improve clinical outcome when appropriate action is initiated. Likewise, a considerable number of patients do not achieve the minimal inhibition of aggregation threshold with the current recommended weight-adjusted dosages of GP IIb/IIIa therapy. Identifying and optimizing the absolute degree of platelet inhibition in this subgroup of patients will probably improve clinical outcome. The VerifyNow platform is one of the most user friendly point-of-care platelet function test systems because it produces rapid results at the patient bedside. The purpose of the present paper is to give insight into the principal mechanisms of the VerifyNow system, to discuss its clinical utility for the monitoring of antiplatelet therapy and to discuss the proposed cut-off levels to segregate responders from non-responders for the different types of antiplatelet therapy. This article was published in Platelets and referenced in Journal of Blood Disorders & Transfusion

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