Thrombocytopenia Resulting from Sensitivity to GPIIb-IIIa Inhibitors

 

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Agents that inhibit the binding of fibrinogen to its platelet receptor (glycoprotein [GP] IIb-IIIa, α_IIb/β₃ integrin) constitute a promising new group of antithrombotic drugs. Acute thrombocytopenia, often occurring within a few hours of starting treatment, is a recognized side effect of this family of compounds. Although most affected patients recover uneventfully, severe bleeding and fatal outcomes have been described. Both nonimmune and immune mechanisms have been implicated in the pathogenesis of this complication, but accumulating evidence suggests that drug-dependent antibodies are responsible for platelet destruction in many (and perhaps most) affected individuals. These antibodies are unique in that they can be present in persons not previously exposed to a GPIIb-IIIa inhibitor, allowing for the possibility that thrombocytopenia can occur within hours of starting treatment. Additional studies are needed to more fully define the characteristics of these antibodies and to identify risk factors that predispose patients to this complication.

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Richard H AsterM.D. 

Blood Research Institute, Blood Center of Southeastern Wisconsin

P.O. Box 2178, Milwaukee, WI 53201-2178

Email: rhaster@bcsew.edu