Circulating procoagulant microparticles and soluble GPV in myocardial infarction treated by primary percutaneous transluminal coronary angioplasty. A possible role for GPIIb-IIIa antagonists

Journal of Thrombosis and Haemostasis : JTH
Olivier MorelF Toti

Abstract

Circulating procoagulant microparticles (MP) were measured as markers of vascular damage and prothrombotic risk in patients undergoing ST-segment myocardial infarction (STEMI) treated by primary percutaneous transluminal coronary angioplasty (PTCA) and additional GPIIb-IIIa antagonists. Cells possibly more responsive to GPIIb-IIIa (alpha(IIb)beta(3)) antagonists were evidenced through MP phenotypes by comparison with healthy volunteers (HV) and STEMI patients treated by PTCA without GPIIb-IIIa antagonist (CP). In 50 STEMI patients, blood samples were collected at day 1 and day 6. Circulating procoagulant MP were captured on annexin V and quantified by prothrombinase assay as nanomolar phosphatidylserine equivalents (nm PhtdSer). Platelet activation by thrombin was confirmed through independent measurement of soluble GPV (sGPV). With respect to HV, procoagulant MP levels were high in patients with STEMI or unstable angina, platelet-derived MP and elevated sGPV testifying to significant platelet activation. A substantial release of endothelial-derived MP was evidenced simultaneously. In abciximab-treated patients, procoagulant MP, mainly of platelet origin, decreased precociously at day 1 (4.2 +/- 0.6 vs. CP 15.5 +/- 2.1 nm PhtdS...Continue Reading

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