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Semin Thromb Hemost 2017; 43(04): 439-446
DOI: 10.1055/s-0037-1599156
Review Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

How Long Does It Take for Clopidogrel and Ticagrelor to Inhibit Platelets in Patients Undergoing Primary Percutaneous Coronary Intervention? A Detailed Pharmacodynamic Analysis: Time Course of Platelet Reactivity in STEMI (TOPS)

Thomas O. Bergmeijer
1   Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands
2   St. Antonius Center for Platelet Function Research, Nieuwegein, The Netherlands
,
Thea C. Godschalk
1   Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands
2   St. Antonius Center for Platelet Function Research, Nieuwegein, The Netherlands
,
Paul W. A. Janssen
1   Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands
2   St. Antonius Center for Platelet Function Research, Nieuwegein, The Netherlands
,
Kim van den Berge
1   Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands
2   St. Antonius Center for Platelet Function Research, Nieuwegein, The Netherlands
,
Nicoline J. Breet
1   Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands
2   St. Antonius Center for Platelet Function Research, Nieuwegein, The Netherlands
,
Johannes C. Kelder
1   Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands
2   St. Antonius Center for Platelet Function Research, Nieuwegein, The Netherlands
,
Christian M. Hackeng
2   St. Antonius Center for Platelet Function Research, Nieuwegein, The Netherlands
3   Department of Clinical Chemistry, St. Antonius Hospital, Nieuwegein, The Netherlands
,
Jurriën M. Ten Berg
1   Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands
2   St. Antonius Center for Platelet Function Research, Nieuwegein, The Netherlands
› Author Affiliations
Further Information

Publication History

Publication Date:
04 April 2017 (online)

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Abstract

Antiplatelet therapy plays a pivotal role in patients with an ST-segment elevation myocardial infarction (STEMI) to prevent further atherothrombotic events, such as stent thrombosis. Although the risk of stent thrombosis is highest in the first hours after primary percutaneous coronary intervention (pPCI), little is known about when an adequate level of platelet inhibition is achieved following a clopidogrel or ticagrelor loading dose in STEMI patients. Patients presenting with STEMI in whom pPCI was performed and who were loaded with 600 mg clopidogrel or 180 mg ticagrelor were eligible for enrolment in this nonrandomized, open label, single-center study. Platelet reactivity was measured before PCI, 6 and 24 hours after loading dose and after 2, 7, and 14 days, using the VerifyNow P2Y12 assay as well as 20 µmol/L adenosine diphosphate stimulated light transmittance aggregometry (LTA). We analyzed the time until a VerifyNow result of < 236 P2Y12 reaction units or LTA maximum platelet aggregation of < 64.5% was reached. A total of 28 patients were participated in this study. Platelet reactivity dropped below the high platelet reactivity cutoff level after 11.4 (VerifyNow) and 5.7 (LTA) hours in patients who were loaded with clopidogrel, and after 2.4 (VerifyNow) and 3.9 (LTA) hours in patients who were loaded with ticagrelor. Despite the administration of a clopidogrel or ticagrelor loading dose, it still takes multiple hours (2–11) to reach adequate platelet inhibition in STEMI patients. This might indicate the need for additional antiplatelet therapy in the first hours after loading in patients undergoing pPCI with stenting.

Keywords

STEMI - myocardial infarction - platelet function test - platelet aggregation - clopidogrel - ticagrelor - morphine
 

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