title: Effects of ad hoc clopidogrel loading versus pre-treatment on P-selectin expression after coronary stent implantation.
abstract: Stents represent a thrombogenic surface where one of the earliest events is the deposition of platelets. Activated platelets express neoepitopes that enable them to form homo- and heterotypic aggregates and activate the coagulation system. In this study, we investigated the effects of ad hoc clopidogrel treatment compared to a clopidogrel pretreated group on platelet P-selectin expression. We found that after stent implantation in the ad hoc treated group, P-selectin expression decreased after 1 h, while the initial decrease in platelet count normalized after 4 h. Aspirin non-responsiveness did not influence the results. These data point to the beneficial effect of clopidogrel treatment in reducing platelet reactivity during stenting.
authors.affiliation: Institute of Cardiology, Debrecen, Hungary.
authors.forename: Tibor
authors.initials: T
authors.lastname: Szük
authors.forename: Béla
authors.initials: B
authors.lastname: Nagy
authors.forename: Zsuzsanna
authors.initials: Z
authors.lastname: Bereczky
authors.forename: Zsolt
authors.initials: Z
authors.lastname: Koszegi
authors.forename: István
authors.initials: I
authors.lastname: Edes
authors.forename: János
authors.initials: J
authors.lastname: Kappelmayer
mesh_terms: D000077144:Clopidogrel; D016503:Drug Delivery Systems; D005434:Flow Cytometry; D006801:Humans; D019007:P-Selectin / Q000187:drug effects / Q000378:metabolism; D015539:Platelet Activation / Q000187:drug effects; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage* / Q000494:pharmacology; D015607:Stents; D013988:Ticlopidine / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D019007:P-Selectin; D010975:Platelet Aggregation Inhibitors; D000077144:Clopidogrel; D013988:Ticlopidine