Variability in Platelet Aggregation Following Sustained Aspirin and Clopidogrel Treatment in Patients With Coronary Heart Disease and Influence of the 807 C/T Polymorphism of the Glycoprotein Ia Gene - 21/08/11
, Antonio Fernandez-Ortiz, MD, PhD b, Esther Bernardo, BSc b, Celia Ramírez, BSc b, Ugo Cavallari, MD c, Elisabetta Trabetti, PhD c, Manel Sabaté, MD, PhD b, Pilar Jimenez-Quevedo, MD b, Rosana Hernández, MD, PhD b, Raul Moreno, MD b, Javier Escaned, MD, PhD b, Fernando Alfonso, MD, PhD b, Camino Bañuelos, MD b, Marco A. Costa, MD, PhD a, Theodore A. Bass, MD a, Pier Franco Pignatti, MD c, Carlos Macaya, MD, PhD b
Corresponding author: Tel: 904-244-3933; fax: 904-244-3102.Résumé |
A broad variability in patient response to dual antiplatelet treatment has been described during the first month of treatment. Data on platelet function profiles in patients on dual antiplatelet therapy for a more sustained period are limited. Whether gene sequence variations of the glycoprotein Ia/IIa receptor influence platelet aggregation in these patients is also unknown. The aim of this study was to characterize platelet aggregation profiles in patients on dual antiplatelet treatment (aspirin plus clopidogrel) for >1 month and to assess whether these may be influenced by the C807T polymorphism of the glycoprotein Ia gene. We included 82 patients, who were divided into 2 groups: carriers (CT + TT genotypes; n = 51) and noncarriers (CC genotype; n = 31) of the mutant T allele. Platelet aggregation was assessed using light transmittance aggregometry after stimuli with adenosine diphosphate (20 μmol/L), collagen (6 μg/ml), and epinephrine (20 μmol/L). A significant variability in the distribution of platelet aggregation was observed in the overall study population, as well as in carriers and noncarriers of the T allele. T allele carriers had increased platelet aggregation compared with noncarriers after stimuli with adenosine diphosphate, collagen, and epinephrine (p <0.05 for all platelet aggregation assays). Thus, platelet aggregation varied significantly in patients on long-term dual antiplatelet treatment and was increased in T allele carriers of the 807C/T polymorphism of the glycoprotein Ia gene. These findings may contribute to the increased ischemic risk observed in these patients.
Le texte complet de cet article est disponible en PDF.| This study was partially supported by a grant from the Spanish Ministry of Health (FIS 00/0026-1), Madrid, Spain; and the Italian Ministry of University and Research and the Veneto Region Sanitary Research Project, Verona, Italy. |
Vol 96 - N° 8
P. 1095-1099 - octobre 2005 Retour au numéro
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