Clopidogrel affects leukocyte dependent platelet aggregation by P2Y12 expressing leukocytes

Basic Research in Cardiology
Philipp DiehlMartin Moser

Abstract

Up to 30% of all patients who are treated with a coronary stent do not respond sufficiently to antiplatelet therapy. This condition results in an increased risk for thrombotic complications such as stent thrombosis and myocardial infarction. The aim of the study was to determine clinical parameters modulating ASA and clopidogrel responsiveness. Patients were enrolled into three groups: (A) Patients with coronary artery disease without recent PCI treated with 100 mg/day ASA (n = 67). (B) Patients who underwent coronary stent implantation taking 100 mg/day ASA and 75 mg/day clopidogrel (n = 87). (C) Patients in whom CAD was excluded by angiography and who were not treated with anti-platelet medication served as controls (n = 32). Platelet aggregation was determined by impedance aggregometry using the Multiplate point of care device. Drug response was differentiated by stimulation of whole blood with arachidonic acid (AA, ASA responsiveness) or adenosine diphosphate (ADP, clopidogrel responsiveness). P2Y(12) receptor expression was determined by RT-PCR. ADP induced platelet aggregation correlated with the leukocyte count (r = 0.61, p < 0.001) suggesting that platelets and leukocytes interact functionally. Clopidogrel treatment abo...Continue Reading

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Citations

Dec 29, 2011·Basic Research in Cardiology·Jinfeng XiaoHongliang Li
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