Thromb Haemost 2013; 110(01): 110-117
DOI: 10.1160/TH13-01-0057
Platelets and Blood Cells
Schattauer GmbH

Clopidogrel pretreatment in primary percutaneous coronary intervention: Prevalence of high on-treatment platelet reactivity and impact on preprocedural patency of the infarct-related artery

José Luis Ferreiro*
1   Heart Diseases Institute, Bellvitge University Hospital – IDIBELL, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain
,
Sílvia Homs*
1   Heart Diseases Institute, Bellvitge University Hospital – IDIBELL, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain
,
Javier Berdejo
1   Heart Diseases Institute, Bellvitge University Hospital – IDIBELL, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain
,
Gerard Roura
1   Heart Diseases Institute, Bellvitge University Hospital – IDIBELL, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain
,
Josep Gómez-Lara
1   Heart Diseases Institute, Bellvitge University Hospital – IDIBELL, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain
,
Rafael Romaguera
1   Heart Diseases Institute, Bellvitge University Hospital – IDIBELL, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain
,
Luis Teruel
1   Heart Diseases Institute, Bellvitge University Hospital – IDIBELL, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain
,
Guillermo Sánchez-Elvira
1   Heart Diseases Institute, Bellvitge University Hospital – IDIBELL, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain
,
Ana Lucrecia Marcano
1   Heart Diseases Institute, Bellvitge University Hospital – IDIBELL, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain
,
Joan Antoni Gómez-Hospital
1   Heart Diseases Institute, Bellvitge University Hospital – IDIBELL, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain
,
Dominick J. Angiolillo
2   University of Florida College of Medicine-Jacksonville, Jacksonville, Florida, USA
,
Ángel Cequier
1   Heart Diseases Institute, Bellvitge University Hospital – IDIBELL, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain
› Author Affiliations
Financial support: Silvia Homs is recipient of a Grant of the Interventional Cardiology Section of the Spanish Society of Cardiology for Post-Residency Training in Research.
Further Information

Publication History

Received: 23 January 2013

Accepted after major revision: 08 April 2013

Publication Date:
30 November 2017 (online)

Summary

To date, there is limited data on levels of platelet inhibition achieved in patients with ST-elevation myocardial infarction (STEMI) who are loaded with clopidogrel and aspirin (ASA) prior to undergoing primary percutaneous coronary intervention (P-PCI). The aim of this investigation was to evaluate the percentage of STEMI patients with high on-treatment platelet reactivity (HPR) to clopidogrel at the time of initiating P-PCI and its association with the initial patency of the infarct-related artery (IRA). This prospective pharmacodynamic study included 50 STEMI patients, previously naïve to oral antiplatelet agents, who received 500-mg ASA and 600-mg clopidogrel loading doses prior to P-PCI. Platelet function assessment was performed at the beginning of the procedure using various assays, including VerifyNow system (primary endpoint), light transmission aggregometry and multiple electrode aggregometry. The percentage of patients with suboptimal response to clopidogrel and ASA assessed with the VerifyNow system was 88.0% and 28.6%, respectively. Similar results were obtained with the other assays used. A higher percentage of patients with initial patency of the IRA was observed among those patients without HPR compared with those with HPR to clopidogrel (66.7% vs 15.9%; p=0.013), while no differences were observed regarding postprocedural angiographic or electrocardiographic outcomes. In conclusion, this study shows that a high percentage of STEMI patients have inadequate levels of clopidogrel-induced and, to a lesser extent, aspirin-mediated platelet inhibition when starting a P-PCI procedure, and suggests that a poor response to clopidogrel might be associated with impaired initial TIMI flow in the IRA.

* JLF and SH contributed equally as first authors to this manuscript.


 
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