Abstract
Aim of our study was to compare effects of eptifibatide and anticoagulants on platelet aggregation and thrombin generation under low versus high coagulant challenge in tissue factor-activated platelet rich plasma. We used a Model allowing simultaneous determination of the time course of platelet aggregation and thrombin generation in the presence of eptifibatide and anticoagulants after extrinsic activation of plasma. Eptifibatide exerted a dose dependent anti-aggregating effect which reached its Maximum at 1000 ng/Ml. Under low coagulant challenge the antiaggregating effect was significantly higher compared to results obtained under high coagulant challenge, but also reached its Maximum at 1000 ng/Ml. Addition of eptifibatide revealed no influence after both high and low coagulant challenge on thrombin generation under our experimental conditions. Eptifibatide prolonged dose dependently the lag phase until the onset of platelet aggregation under low coagulant but not under high coagulant challenge. Under both high and low coagulant challenge UH, LMWH, and rH dose dependently decreased thrombin generation, but had no influence on platelet aggregation. Combination of eptifibatide and anticoagulants resulted in significant additive prolongation of the lag phase, More pronounced under low coagulant challenge. Combination of eptifibatide and anticoagulants under high coagulant challenge had a significant synergistic inhibitory effect on platelet aggregation. In contrast, under low coagulant challenge addition of anticoagulants to plasma that contained eptifibatide did not add to inhibition of platelet aggregation. Combined addition of eptifibatide and anticoagulants to plasma did not significantly add to the decrease of thrombin generation at high coagulant challenge. Interestingly, under low coagulant challenge combination of eptifibatide and LMWH resulted in significantly reduced thrombin generation compared to Measurements in the absence of eptifibatide. Combined administration of eptifibatide with rH, or UH under low coagulant challenge did not result in reduced thrombin generation.
Our in vitro experiments support the notion that combined application of eptifibatide and anticoagulants Might be beneficial in atherosclerotic disease to palliate the high thrombogenic challenge of ruptured atherosclerotic plaques.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Scarborough RM. Development of eptifibatide. AM Heart J 1999;138:1093–104.
Phillips DR, Scarborough RM. Clinical pharmacology of eptifibatide. AM J Cardiol 1997;80:11B–20B.
Scarborough RM. Eptifibatide. Drugs future 1998;23:1–6.
Gallistl S, Muntean W. Thrombin-hirudin complex formation, thrombin-antithrombin III complex formation, and thrombin generation after intrinsic activation of plasma. Thromb Haemost 1994;72:387–92.
Gallistl S, Muntean W, Leis HJ. Effects of heparin and hirudin on thrombin generation and platelet aggregation after intrinsic activation of platelet rich plasma. Thromb Haemost 1995;74:1163–68.
Pieters J, Lindhout T. The limited importance of factor Xa inhibition to the anticoagulant property of heparin in thromboplastin-activated plasma. Blood 1988;72:2048–52.
Koestenberger M, Gallistl S, Cvirn G, Roschitz B, Muntean W. Effects of the glycoprotein Ilb/IIIa receptor antagonist c7E3 Fab and anticoagulants on platelet aggregation and thrombin potential under high coagulant challenge in vitro. Blood Coagul Fibrinolysis 2000;11:425–32.
The IMPACT-II investigators. Randomized placebo-controlled trial of effect of eptifibatide on complications of percutaneous coronary intervention: IMPACT II. Lancet 1997;349:1422–28.
Ohman EM, Kleiman NS, Gacioch G, Worley SJ, Navetta FI, Talley JD, Anderson HV, Ellis SG, Cohen MD, Sriggs D, Miller M, Kereiakes D, Yakubov S, Kitt MM, Sigmon KN, Califf RM, Krucoff MW, Topol EJ. Combined accelerated tissue-plasminogen activator and platelet glycoprotein Ilb/IIIa integrin receptor blockade with integrilin in acute Myocardial infarction. Circulation 1997;95:846–54.
Butenas S, Cawthern KM, van’t Veer C, DiLorenzo ME, Lock JB, Mann KG. Antiplatelet agents in tissue factor-induced blood coagulation. Blood 2001;97:2314–22.
Li Y, Spencer FA, Ball S, Becker RC. Inhibition of platelet-dependent prothrombinase activity and thrombin generation by glycoprotein Ilb/IIIa receptor-directed antagonists: Potential contributing Mechanism of benefit in acute coronary syndromes. J Thromb Thrombolysis 2000;10:69–76.
Kleiman NS, Tracy RP, Talley JD, Sigmon K, Joseph D, Topol EJ, Califf RM, Kitt M, Ohman EM. Inhibition of platelet aggregation with a glycoprotein Ilb-IIIa antagonist does not prevent thrombin generation in patients undergoing thrombolysis for acute Myocardial infarction. J Thromb Thrombolysis 2000;9:5–12.
Suzuki YS, Hillyer P, Miyamoto S, Niewiaroski S, Sun L, Rao AK, Hollenbach S, Edmunds LH. Integrilin prevents prolonged bleeding times after cardiopulmonary bypass. Ann Thorac Surg 1998;66:373–81.
Hemker HC, Beguin S. Thrombin generation in plasma: Its assessment via the endogenous thrombin potential. Thromb Haemost 1995;74:134–38.
Hemker HC, Wielders S, Kessels H, Beguin S. Continuous registration of thrombin generation in plasma, its use for the determination of the thrombin potential. Thromb Haemost 1993;70:617–24.
Van’t Veer C, Mann KG. Regulation of tissue factor initiated thrombin generation by the stoichiometric inhibitors tissue factor pathway inhibitor, antithrombin-III and heparin cofactor-II. J Biol Chem 1997;272:4367–77.
Rapaport SI. The extrinsic pathway inhibitor: a regulator of tissue factor-dependent blood coagulation. Thromb Haemost 1991;66(1):6–15.
Dörmann D, Clemetson KJ, Kehrel BE. The GPIb thrombin-binding site is essential for thrombin-induced platelet procoagulant activity. Blood 2000;96:2469–78.
Storey RF, Wilcox RG, Heptinstall S. Differential effects of glycoprotein Ilb/IIIa antagonists on platelet Microaggregate and Macroaggregate formation and effect of anticoagulant on antagonist potency. Circulation 1998;98:1616–21.
Cohen M, Theroux P, Weber S, Lavamee P, Huynh T, Borzak S, Diodati JG, Squire IB, Deckelbaum LI, Thornton AR, Harris KE, Sax FL, Lo MW, White HD. Combination therapy with tirofiban and enoxaparin in acute coronary syndromes. Int J Cardiol 1999;71:273–81
Weitz JI. Activation of blood coagulation by plaque rupture: Mechanisms and prevention. AM J Cardiol 1995;75:18B–22B.
Turpie AG. Clinical potential of antithrombotic drugs in coronary syndromes. AM J Cardiol 1998;82:11L–14L.
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2003 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Köstenberger, M., Gallistl, S., Cvirn, G., Petritsch, M., Leschnik, B., Muntean, W. (2003). In vitro Effects of combined Administration of Eptifibatide and Anticoagulants on Thrombin induced Platelet Aggregation after high versus low Coagulant Activation of Platelet Rich Plasma. In: Scharrer, I., Schramm, W. (eds) 32nd Hemophilia Symposium. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18150-4_40
Download citation
DOI: https://doi.org/10.1007/978-3-642-18150-4_40
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-43884-7
Online ISBN: 978-3-642-18150-4
eBook Packages: Springer Book Archive