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

• Published in: The American journal of cardiology 2005-10, Vol.96 (8), p.1095-1099
• Main Authors: Angiolillo, Dominick J., Fernandez-Ortiz, Antonio, Bernardo, Esther, Ramírez, Celia, Cavallari, Ugo, Trabetti, Elisabetta, Sabaté, Manel, Jimenez-Quevedo, Pilar, Hernández, Rosana, Moreno, Raul, Escaned, Javier, Alfonso, Fernando, Bañuelos, Camino, Costa, Marco A., Bass, Theodore A., Pignatti, Pier Franco, Macaya, Carlos
• Format: Article
• Language: English
• Subjects: Adult; Alleles; Anti-Inflammatory Agents, Non-Steroidal - therapeutic use; Aspirin; Aspirin - therapeutic use; Biological and medical sciences; Cardiology. Vascular system; Cardiovascular disease; Coronary Disease - drug therapy; Coronary heart disease; Drug therapy; Epinephrine - pharmacology; Female; Genes; Glycoproteins; Heart; Humans; Integrin alpha2 - drug effects; Integrin alpha2 - genetics; Male; Medical sciences; Platelet Aggregation - drug effects; Platelet Aggregation - genetics; Platelet Aggregation Inhibitors - therapeutic use; Polymorphism; Polymorphism, Genetic; Ticlopidine - analogs & derivatives; Ticlopidine - therapeutic use
• ISSN: 0002-9149; 1879-1913
• DOI: 10.1016/j.amjcard.2005.06.039

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