Skip to main content
Log in

Clopidogrel

The Data, the Experience, and the Controversies

  • Review Article
  • Published:
American Journal of Cardiovascular Drugs Aims and scope Submit manuscript

Abstract

Dual antiplatelet therapy with acetylsalicylic acid (aspirin) and clopidogrel is a guideline-recommended standard of care for patients with acute coronary syndromes (ACS) and those who undergo percutaneous coronary intervention (PCI). Despite a large body of clinical evidence obtained from randomized clinical trials and patient registries supporting the efficacy and safety of aspirin plus clopidogrel therapy in these patients, questions concerning the optimal use of dual antiplatelet therapy remain. Widely debated topics pertaining to dual antiplatelet therapy in patients with ACS or undergoing PCI include (i) the appropriate clopidogrel loading dose; (ii) the optimal time to initiate the clopidogrel loading dose; (iii) the optimal duration of dual antiplatelet therapy following ACS or PCI; (iv) impact of variability of platelet response on patient outcomes; and (v) the role of other recommended and emerging P2Y12 antagonists. This review discusses these ongoing controversies regarding the optimal use of dual antiplatelet therapy with aspirin and clopidogrel in patients with ACS or those undergoing PCI.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Table I
Table II
Table III

Similar content being viewed by others

References

  1. Wright RS, Anderson JL, Adams CD, et al. 2011 ACCF/AHA focused update of the guidelines for the management of patients with unstable angina/non-ST-elevation myocardial infarction (updating the 2007 guideline): a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Circulation 2011 May 10; 123(18): 2022–60

    PubMed  Google Scholar 

  2. Antman EM, Hand M, Armstrong PW, et al. 2007 Focused update of the ACC/AHA 2004 guidelines for the management of patients with ST-elevation myocardial infarction: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. Circulation 2007 Dec 10; 117: 296–329

    PubMed  Google Scholar 

  3. Kushner FG, Hand M, Smith Jr SC, et al. 2009 focused updates: ACC/AHA guidelines for the management of patients with ST-elevation myocardial infarction (updating the 2004 guidelines and 2007 focused update) and ACC/AHA/SCAI guidelines on percutaneous coronary intervention (updating the 2005 guideline and 2007 focused update): a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Circulation 2009; 120(22): 2271–306

    PubMed  Google Scholar 

  4. Levine GN, Bates ER, Blankenship JC, et al. 2011 ACCF/AHA/SCAI guideline for percutaneous coronary intervention: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines and the Society for Cardiovascular Angiography and Interventions. Circulation 2011 Dec 6; 124(23): e574–651

    PubMed  Google Scholar 

  5. Hamm CW, Bassand JP, Agewall S, et al. ESC guidelines for the management of acute coronary syndromes in patients presenting without persistent ST-segment elevation: the Task Force for the management of acute coronary syndromes (ACS) in patients presenting without persistent ST-segment elevation of the European Society of Cardiology (ESC). Eur Heart J 2011 Dec; 32(23): 2999–3054

    PubMed  Google Scholar 

  6. Van de Werf F, Bax J, Betriu A, et al. Management of acute myocardial infarction in patients presenting with persistent ST-segment elevation: the Task Force on the Management of ST-Segment Elevation Acute Myocardial Infarction of the European Society of Cardiology. Eur Heart J 2008 Dec; 29(23): 2909–45

    PubMed  Google Scholar 

  7. Wijns W, Kolh P, Danchin N, et al. Guidelines on myocardial revascularization. Eur Heart J 2010 Oct; 31(20): 2501–55

    PubMed  Google Scholar 

  8. Mehta SR, Yusuf S, Peters RJ, et al. Effects of pretreatment with clopidogrel and aspirin followed by long-term therapy in patients undergoing percutaneous coronary intervention: the PCI-CURE study. Lancet 2001 Aug 18; 358(9281): 527–33

    PubMed  CAS  Google Scholar 

  9. Yusuf S, Zhao F, Mehta SR, et al. Effects of clopidogrel in addition to aspirin in patients with acute coronary syndromes without ST-segment elevation. N Engl J Med 2001 Aug 16; 345(7): 494–502

    PubMed  CAS  Google Scholar 

  10. Steinhubl SR, Berger PB, Mann 3rd JT, et al. Early and sustained dual oral antiplatelet therapy following percutaneous coronary intervention: a randomized controlled trial. JAMA 2002 Nov 20; 288(19): 2411–20

    PubMed  CAS  Google Scholar 

  11. Chen ZM, Jiang LX, Chen YP, et al. Addition of clopidogrel to aspirin in 45,852 patients with acute myocardial infarction: randomised placebo-controlled trial. Lancet 2005 Nov 5; 366(9497): 1607–21

    PubMed  CAS  Google Scholar 

  12. Sabatine MS, Cannon CP, Gibson CM, et al. Addition of clopidogrel to aspirin and fibrinolytic therapy for myocardial infarction with ST-segment elevation. N Engl J Med 2005 Mar 24; 352(12): 1179–89

    PubMed  CAS  Google Scholar 

  13. Sabatine MS, Cannon CP, Gibson CM, et al. Effect of clopidogrel pretreatment before percutaneous coronary intervention in patients with ST-elevation myocardial infarction treated with fibrinolytics: the PCICLARITY study. JAMA 2005 Sep 14; 294(10): 1224–32

    PubMed  CAS  Google Scholar 

  14. Alexander D, Ou FS, Roe MT, et al. Use of and inhospital outcomes after early clopidogrel therapy in patients not undergoing an early invasive strategy for treatment of non-ST-segment elevation myocardial infarction: results from Can Rapid risk stratification of Unstable angina patients Suppress ADverse outcomes with Early implementation of the American College of Cardiology/American Heart Association guidelines (CRUSADE). Am Heart J 2008 Sep; 156(3): 606–12

    PubMed  Google Scholar 

  15. Witkowski A, Maciejewski P, Wasek W, et al. Influence of different antiplatelet treatment regimens for primary percutaneous coronary intervention on all-cause mortality. Eur Heart J 2009 Jul; 30(14): 1736–43

    PubMed  CAS  Google Scholar 

  16. Zeymer U, Gitt A, Jünger C, et al. Clopidogrel in addition to aspirin reduces in-hospital major cardiac and cerebrovascular events in unselected patients with acute ST segment elevation myocardial. Thromb Haemost 2008 Jan; 99(1): 155–60

    PubMed  CAS  Google Scholar 

  17. Zeymer U, Gitt AK, Zahn R, et al. Clopidogrel in addition to aspirin reduces one-year major adverse cardiac and cerebrovascular events in unselected patients with non-ST segment elevation myocardial infarction. Acute Card Care 2008; 10(1): 43–8

    PubMed  Google Scholar 

  18. Lev EI, Kornowski R, Vaknin-Assa H, et al. Effect of clopidogrel pretreatment on angiographic and clinical outcomes in patients undergoing primary percutaneous coronary intervention for ST-elevation acute myocardial infarction. Am J Cardiol 2008 Feb 15; 101(4): 435–9

    PubMed  CAS  Google Scholar 

  19. Sibbald M, Yan AT, Huang W, et al. Association between smoking, outcomes, and early clopidogrel use in patients with acute coronary syndrome: insights from the Global Registry of Acute Coronary Events. Am Heart J 2010 Nov; 160(5): 855–61

    PubMed  Google Scholar 

  20. Szük T, Gyöngyösi M, Homorodi N, et al. Effect of timing of clopidogrel administration on 30-day clinical outcomes: 300-mg loading dose immediately after coronary stenting versus pretreatment 6 to 24 hours before stenting in a large unselected patient cohort. Am Heart J 2007 Feb; 153(2): 289–95

    PubMed  Google Scholar 

  21. Steinhubl SR, Berger PB, Brennan DM, et al. Optimal timing for the initiation of pre-treatment with 300 mg clopidogrel before percutaneous coronary intervention. J Am Coll Cardiol 2006 Mar 7; 47(5): 939–43

    PubMed  CAS  Google Scholar 

  22. Lewis BS, Mehta SR, Fox KA, et al. Benefit of clopidogrel according to timing of percutaneous coronary intervention in patients with acute coronary syndromes: further results from the Clopidogrel in Unstable angina to prevent Recurrent Events (CURE) study. Am Heart J 2005 Dec; 150(6): 1177–84

    PubMed  CAS  Google Scholar 

  23. Pickard AS, Becker RC, Schumock GT, et al. Clopidogrel-associated bleeding and related complications in patients undergoing coronary artery bypass grafting. Pharmacotherapy 2008 Mar; 28(3): 376–92

    PubMed  CAS  Google Scholar 

  24. Fox KA, Anderson Jr FA, Dabbous OH, et al. Intervention in acute coronary syndromes: do patients undergo intervention on the basis of their risk characteristics? The Global Registry of Acute Coronary Events (GRACE). Heart 2007 Feb; 93(2): 177–82

    PubMed  CAS  Google Scholar 

  25. Yang EH, Gumina RJ, Lennon RJ, et al. Emergency coronary artery bypass surgery for percutaneous coronary interventions: changes in the incidence, clinical characteristics, and indications from 1979 to 2003. J Am Coll Cardiol 2005 Dec 6; 46(11): 2004–9

    PubMed  Google Scholar 

  26. Sadanandan S, Cannon CP, Gibson CM, et al. A risk score to estimate the likelihood of coronary artery bypass surgery during the index hospitalization among patients with unstable angina and non-ST-segment elevation myocardial infarction. J Am Coll Cardiol 2004 Aug 18; 44(4): 799–803

    PubMed  Google Scholar 

  27. Widimsky P, Motovska Z, Simek S, et al. Clopidogrel pre-treatment in stable angina: for all patients >6 h before elective coronary angiography or only for angiographically selected patients a few minutes before PCI? A randomized multicentre trial PRAGUE-8. Eur Heart J 2008 Jun; 29(12): 1495–503

    PubMed  CAS  Google Scholar 

  28. Di Sciascio G, Patti G, Pasceri V, et al. Effectiveness of in-laboratory high-dose clopidogrel loading versus routine pre-load in patients undergoing percutaneous coronary intervention: results of the ARMYDA-5 PRELOAD (Antiplatelet therapy for Reduction of MYocardial Damage during Angioplasty) randomized trial. J Am Coll Cardiol 2010 Aug 10; 56(7): 550–7

    PubMed  Google Scholar 

  29. Müller I, Seyfarth M, Rüdiger S, et al. Effect of a high loading dose of clopidogrel on platelet function in patients undergoing coronary stent placement. Heart 2001 Jan; 85(1): 92–3

    PubMed  Google Scholar 

  30. von Beckerath N, Taubert D, Pogatsa-Murray G, et al. Absorption, metabolization, and antiplatelet effects of 300-, 600-, and 900-mg loading doses of clopidogrel: results of the ISAR-CHOICE (Intracoronary Stenting and Antithrombotic Regimen: Choose Between 3 High Oral Doses for Immediate Clopidogrel Effect) trial. Circulation 2005 Nov 8; 112(19): 2946–50

    Google Scholar 

  31. Gurbel PA, Bliden KP, Zaman KA, et al. Clopidogrel loading with eptifibatide to arrest the reactivity of platelets: results of the Clopidogrel Loading With Eptifibatide to Arrest the Reactivity of Platelets (CLEAR PLATELETS) study. Circulation 2005 Mar 8; 111(9): 1153–9

    PubMed  CAS  Google Scholar 

  32. Angiolillo DJ, Fernández-Ortiz A, Bernardo E, et al. High clopidogrel loading dose during coronary stenting: effects on drug response and inter-individual variability. Eur Heart J 2004 Nov; 25(21): 1903–10

    PubMed  CAS  Google Scholar 

  33. Cuisset T, Frere C, Quilici J, et al. Benefit of a 600-mg loading dose of clopidogrel on platelet reactivity and clinical outcomes in patients with non-ST-segment elevation acute coronary syndrome undergoing coronary stenting. J Am Coll Cardiol 2006 Oct 3; 48(7): 1339–45

    PubMed  CAS  Google Scholar 

  34. Gurbel PA, Bliden KP, Hayes KM, et al. The relation of dosing to clopidogrel responsiveness and the incidence of high post-treatment platelet aggregation in patients undergoing coronary stenting. J Am Coll Cardiol 2005 May 3; 45(9): 1392–6

    PubMed  CAS  Google Scholar 

  35. Montalescot G, Sideris G, Meuleman C, et al. A randomized comparison of high clopidogrel loading doses in patients with non-ST-segment elevation acute coronary syndromes: the ALBION (Assessment of the Best Loading Dose of Clopidogrel to Blunt Platelet Activation, Inflammation and Ongoing Necrosis) trial. J Am Coll Cardiol 2006 Sep 5; 48(5): 931–8

    PubMed  CAS  Google Scholar 

  36. Lotrionte M, Biondi-Zoccai GG, Agostoni P, et al. Meta-analysis appraising high clopidogrel loading in patients undergoing percutaneous coronary intervention. Am J Cardiol 2007 Oct 15; 100(8): 1199–206

    PubMed  CAS  Google Scholar 

  37. Jung JH, Min PK, Lee SH, et al. Clopidogrel pretreatment before primary percutaneous coronary stenting in patients with acute ST-segment elevation myocardial infarction: comparison of high loading dose (600 mg) versus low loading dose (300 mg). Coron Artery Dis 2009 Mar; 20(2): 150–4

    PubMed  Google Scholar 

  38. Bonello L, Lemesle G, De Labriolle A, et al. Impact of a 600-mg loading dose of clopidogrel on 30-day outcome in unselected patients undergoing percutaneous coronary intervention. Am J Cardiol 2008 Nov 15; 102(10): 1318–22

    PubMed  CAS  Google Scholar 

  39. Abuzahra M, Pillai M, Caldera A, et al. Comparison of higher clopidogrel loading and maintenance dose to standard dose on platelet function and outcomes after percutaneous coronary intervention using drug-eluting stents. Am J Cardiol 2008 Aug 15; 102(4): 401–3

    PubMed  CAS  Google Scholar 

  40. Lemesle G, Delhaye C, Sudre A, et al. Impact of high loading and maintenance dose of clopidogrel within the first 15 days after percutaneous coronary intervention on patient outcome. Am Heart J 2009 Feb; 157(2): 375–82

    PubMed  CAS  Google Scholar 

  41. Mangiacapra F, Muller O, Ntalianis A, et al. Comparison of 600 versus 300-mg Clopidogrel loading dose in patients with ST-segment elevation myocardial infarction undergoing primary coronary angioplasty. Am J Cardiol 2010 Nov 1; 106(9): 1208–11

    PubMed  CAS  Google Scholar 

  42. Mehta SR, Bassand JP, Chrolavicius S, et al. Dose comparisons of clopidogrel and aspirin in acute coronary syndromes. N Engl J Med 2010; 363(10): 930–42

    PubMed  Google Scholar 

  43. Mehta SR, Tanguay JF, Eikelboom JW, et al. Double-dose versus standard-dose clopidogrel and high-dose versus low-dose aspirin in individuals undergoing percutaneous coronary intervention for acute coronary syndromes (CURRENT-OASIS 7): a randomised factorial trial. Lancet 2010; 376(9748): 1233–43

    PubMed  CAS  Google Scholar 

  44. Patti G, Barczi G, Orlic D, et al. Outcome comparison of 600- and 300-mg loading doses of clopidogrel in patients undergoing primary percutaneous coronary intervention for ST-segment elevation myocardial infarction: results from the ARMYDA-6 MI (Antiplatelet therapy for Reduction of MYocardial Damage during Angioplasty-Myocardial Infarction) randomized study. J Am Coll Cardiol 2011 Oct 4; 58(15): 1592–9

    PubMed  CAS  Google Scholar 

  45. Collet JP, Silvain J, Landivier A, et al. Dose effect of clopidogrel reloading in patients already on 75-mg maintenance dose: the Reload with Clopidogrel Before Coronary Angioplasty in Subjects Treated Long Term with Dual Antiplatelet Therapy (RELOAD) study. Circulation 2008 Sep 16; 118(12): 1225–33

    PubMed  CAS  Google Scholar 

  46. Kastrati A, von Beckerath N, Joost A, et al. Loading with 600 mg clopidogrel in patients with coronary artery disease with and without chronic clopidogrel therapy. Circulation 2004 Oct 5; 110(14): 1916–9

    PubMed  CAS  Google Scholar 

  47. Di Sciascio G, Patti G, Pasceri V, et al. Clopidogrel reloading in patients undergoing percutaneous coronary intervention on chronic clopidogrel therapy: results of the ARMYDA-4 RELOAD (Antiplatelet therapy for Reduction of MYocardial Damage during Angioplasty) randomized trial. Eur Heart J 2010 Jun; 31(11): 1337–43

    PubMed  Google Scholar 

  48. Mahmoudi M, Syed AI, Ben-Dor I, et al. Safety and efficacy of clopidogrel reloading in patients on chronic clopidogrel therapy who present with an acute coronary syndrome and undergo percutaneous coronary intervention. Am J Cardiol 2011 Jun 15; 107(12): 1779–82

    PubMed  CAS  Google Scholar 

  49. Smith Jr SC, Feldman TE, Hirshfeld Jr JW, et al. ACC/AHA/SCAI 2005 guideline update for percutaneous coronary intervention: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (ACC/AHA/SCAI Writing Committee to Update 2001 Guidelines for Percutaneous Coronary Intervention). Circulation 2006 Feb21; 113(7): e166–286

    PubMed  Google Scholar 

  50. Moses JW, Leon MB, Popma JJ, et al. Sirolimus-eluting stents versus standard stents in patients with stenosis in a native coronary artery. N Engl J Med 2003 Oct 2; 349(14): 1315–23

    PubMed  CAS  Google Scholar 

  51. Stone GW, Ellis SG, Cox DA, et al. A polymer-based, paclitaxel-eluting stent in patients with coronary artery disease. N Engl J Med 2004 Jan 15; 350(3): 221–31

    PubMed  CAS  Google Scholar 

  52. Eisenstein EL, Anstrom KJ, Kong DF, et al. Clopidogrel use and long-term clinical outcomes after drug-eluting stent implantation. JAMA 2007 Jan 10; 297(2): 159–68

    PubMed  CAS  Google Scholar 

  53. Butler MJ, Eccleston D, Clark DJ, et al. The effect of intended duration of clopidogrel use on early and late mortality and major adverse cardiac events in patients with drug-eluting stents. Am Heart J 2009 May; 157(5): 899–907

    PubMed  CAS  Google Scholar 

  54. Spertus JA, Kettelkamp R, Vance C, et al. Prevalence, predictors, and outcomes of premature discontinuation of thienopyridine therapy after drug-eluting stent placement: results from the PREMIER registry. Circulation 2006 Jun 20; 113(24): 2803–9

    PubMed  CAS  Google Scholar 

  55. Ho PM, Fihn SD, Wang L, et al. Clopidogrel and long-term outcomes after stent implantation for acute coronary syndrome. Am Heart J 2007 Nov; 154(5): 846–51

    PubMed  CAS  Google Scholar 

  56. Brar SS, Kim J, Brar SK, et al. Long-term outcomes by clopidogrel duration and stent type in a diabetic population with de novo coronary artery lesions. J Am Coll Cardiol 2008 Jun 10; 51(23): 2220–7

    PubMed  CAS  Google Scholar 

  57. Pfisterer M, Brunner-La Rocca HP, Buser PT, et al. Late clinical events after clopidogrel discontinuation may limit the benefit of drug-eluting stents: an observational study of drug-eluting versus bare-metal stents. J Am Coll Cardiol 2006 Dec 19; 48(12): 2584–91

    PubMed  CAS  Google Scholar 

  58. Pfisterer M, Brunner-La Rocca HP, Rickenbacher P, et al. Long-term benefit-risk balance of drug-eluting vs. bare-metal stents in daily practice: does stent diameter matter? Three-year follow-up of BASKET. Eur Heart J 2009 Jan; 30(1): 16–24

    PubMed  Google Scholar 

  59. Joner M, Finn AV, Farb A, et al. Pathology of drug-eluting stents in humans: delayed healing and late thrombotic risk. J Am Coll Cardiol 2006 Jul 4; 48(1): 193–202

    PubMed  Google Scholar 

  60. Banerjee S, Varghese C, Samuel J, et al. Comparison of the impact of short (<1 year) and long-term (> or =1 year) clopidogrel use following percutaneous coronary intervention on mortality. Am J Cardiol 2008 Nov 1; 102(9): 1159–62

    PubMed  CAS  Google Scholar 

  61. Dean J, Yujie Z, Yingxin Z, et al. Prolonged dual antiplatelet therapy improves clinical outcomes in high-risk patients implanted with sirolimuseluting stents. Clin Cardiol 2009 Mar; 32(3): 164–8

    PubMed  Google Scholar 

  62. Roy P, Bonello L, Torguson R, et al. Temporal relation between clopidogrel cessation and stent thrombosis after drug-eluting stent implantation. Am J Cardiol 2009 Mar 15; 103(6): 801–5

    PubMed  CAS  Google Scholar 

  63. Park DW, Yun SC, Lee SW, et al. Stent thrombosis, clinical events, and influence of prolonged clopidogrel use after placement of drug-eluting stent data from an observational cohort study of drug-eluting versus bare-metal stents. JACC Cardiovasc Interv 2008 Oct; 1(5): 494–503

    PubMed  Google Scholar 

  64. Harjai KJ, Shenoy C, Orshaw P, et al. Dual antiplatelet therapy for more than 12 months after percutaneous coronary intervention: insights from the Guthrie PCI Registry. Heart 2009 Oct; 95(19): 1579–86

    PubMed  CAS  Google Scholar 

  65. Park SJ, Park DW, Kim YH, et al. Duration of dual antiplatelet therapy after implantation of drug-eluting stents. N Engl J Med 2010 Apr 15; 362(15): 1374–82

    PubMed  CAS  Google Scholar 

  66. Gwon HC, Hahn JY, Park KW, et al. Six-month versus 12-month dual antiplatelet therapy after implantation of drug-eluting stents: the Efficacy of Xience/Promus Versus Cypher to Reduce Late Loss After Stenting (EXCELLENT) randomized, multicenter study. Circulation 2012 Jan 24; 125(3): 505–13

    PubMed  CAS  Google Scholar 

  67. Valgimigli M, Campo G, Monti M, et al. Short- versus long-term duration of dual-antiplatelet therapy after coronary stenting: a randomized multicenter trial. Circulation 2012 Apr 24; 125(16): 2015–26

    PubMed  CAS  Google Scholar 

  68. Bernardi V, Szarfer J, Summay G, et al. Long-term versus short-term clopidogrel therapy in patients undergoing coronary stenting (from the Randomized Argentine Clopidogrel Stent [RACS] trial). Am J Cardiol 2007 Feb 1; 99(3): 349–52

    PubMed  CAS  Google Scholar 

  69. Byrne RA, Schulz S, Mehilli J, et al. Rationale and design of a randomized, double-blind, placebo-controlled trial of 6 versus 12 months clopidogrel therapy after implantation of a drug-eluting stent: the Intracoronary Stenting and Antithrombotic Regimen: Safety And EFficacy of 6 Months Dual Antiplatelet Therapy After Drug-Eluting Stenting (ISAR-SAFE) study. Am Heart J 2009 Apr; 157(4): 620–4 e2

    PubMed  CAS  Google Scholar 

  70. Dallas VA Medical Center. Study of optimal clopidogrel duration in patients receiving drug eluting stents (SCORE trial) [ClinicalTrials.gov identifier NCT00781573]. US National Institutes of Health, ClinicalTrials.gov [online]. Available from URL: http://www.clinicaltrials.gov [Accessed 2012 May 8]

  71. French Cardiology Society, Abbott Vascular. The ITALIC study: is there a life for drug-eluting stents (DES) after discontinuation of clopidogrel [ClinicalTrials.gov identifier NCT00780156]. US National Institutes of Health, ClinicalTrials.gov [online]. Available from URL: http://www.clinicaltrials.gov [Accessed 2012 May 8]

  72. Seung-Jung Park, CardioVascular Research Foundation, Korea. Duration of clopidogrel therapy after drug-eluting stent (DES-LATE) [ClinicalTrials. gov identifier NCT01186146]. US National Institutes of Health, Clinical-Trials.gov [online]. Available from URL: http://www.clinicaltrials.gov [Accessed 2012 May 8]

  73. Schwartz KA, Schwartz DE, Barber K, et al. Non-compliance is the predominant cause of aspirin resistance in chronic coronary arterial disease patients. J Transl Med 2008; 6: 46

    PubMed  Google Scholar 

  74. Serebruany VL, Steinhubl SR, Berger PB, et al. Variability in platelet responsiveness to clopidogrel among 544 individuals. J Am Coll Cardiol 2005 Jan 18; 45(2): 246–51

    PubMed  CAS  Google Scholar 

  75. Snoep JD, Hovens MM, Eikenboom JC, et al. Clopidogrel nonresponsiveness in patients undergoing percutaneous coronary intervention with stenting: a systematic review and meta-analysis. Am Heart J 2007 Aug; 154(2): 221–31

    PubMed  CAS  Google Scholar 

  76. Ferguson AD, Dokainish H, Lakkis N. Aspirin and clopidogrel response variability: review of the published literature. Tex Heart Inst J 2008; 35(3): 313–20

    PubMed  Google Scholar 

  77. Müller-Schunk S, Linn J, Peters N, et al. Monitoring of clopidogrel-related platelet inhibition: correlation of nonresponse with clinical outcome in supra-aortic stenting. AJNR Am J Neuroradiol 2008 Apr; 29(4): 786–91

    PubMed  Google Scholar 

  78. Barragan P, Bouvier JL, Roquebert PO, et al. Resistance to thienopyridines: clinical detection of coronary stent thrombosis by monitoring of vasodilator-stimulated phosphoprotein phosphorylation. Catheter Cardiovasc Interv 2003 Jul; 59(3): 295–302

    PubMed  Google Scholar 

  79. Sofi F, Marcucci R, Gori AM, et al. Clopidogrel non-responsiveness and risk of cardiovascular morbidity: an updated meta-analysis. Thromb Haemost 2010 Apr; 103(4): 841–8

    PubMed  CAS  Google Scholar 

  80. Mueller T, Dieplinger B, Poelz W, et al. Utility of whole blood impedance aggregometry for the assessment of clopidogrel action using the novel Multiplate analyzer: comparison with two flow cytometric methods. Thromb Res 2007; 121(2): 249–58

    PubMed  CAS  Google Scholar 

  81. Lordkipanidze M, Pharand C, Nguyen TA, et al. Comparison of four tests to assess inhibition of platelet function by clopidogrel in stable coronary artery disease patients. Eur Heart J 2008 Dec; 29(23): 2877–85

    PubMed  Google Scholar 

  82. Angiolillo DJ, Fernandez-Ortiz A, Bernardo E, et al. Variability in individual responsiveness to clopidogrel: clinical implications, management, and future perspectives. J Am Coll Cardiol 2007 Apr 10; 49(14): 1505–16

    PubMed  CAS  Google Scholar 

  83. Cattaneo M. Resistance to antiplatelet drugs: molecular mechanisms and laboratory detection. J Thromb Haemost 2007 Jul; 5 Suppl. 1: 230–7

    PubMed  CAS  Google Scholar 

  84. Bonello L, Tantry US, Marcucci R, et al. Consensus and future directions on the definition of high on-treatment platelet reactivity to adenosine diphosphate. J Am Coll Cardiol 2010 Sep 14; 56(12): 919–33

    PubMed  CAS  Google Scholar 

  85. Grines CL, Bonow RO, Casey Jr DE, et al. Prevention of premature discontinuation of dual antiplatelet therapy in patients with coronary artery stents: a science advisory from the American Heart Association, American College of Cardiology, Society for Cardiovascular Angiography and Interventions, American College of Surgeons, and American Dental Association, with representation from the American College of Physicians. Circulation 2007 Feb 13; 115(6): 813–8

    PubMed  Google Scholar 

  86. Gilard M, Arnaud B, Le Gal G, et al. Influence of omeprazol on the antiplatelet action of clopidogrel associated to aspirin. J Thromb Haemost 2006 Nov; 4(11): 2508–9

    PubMed  CAS  Google Scholar 

  87. Gilard M, Arnaud B, Cornily JC, et al. Influence of omeprazole on the antiplatelet action of clopidogrel associated with aspirin: the randomized, double-blind OCLA (Omeprazole CLopidogrel Aspirin) study. J Am Coll Cardiol 2008 Jan 22; 51(3): 256–60

    PubMed  CAS  Google Scholar 

  88. Cuisset T, Frere C, Quilici J, et al. Comparison of omeprazole and pantoprazole influence on a high 150-mg clopidogrel maintenance dose the PACA (Proton Pump Inhibitors And Clopidogrel Association) prospective randomized study. J Am Coll Cardiol 2009 Sep 22; 54(13): 1149–53

    PubMed  CAS  Google Scholar 

  89. O’Donoghue ML, Braunwald E, Antman EM, et al. Pharmacodynamic effect and clinical efficacy of clopidogrel and prasugrel with or without a proton-pump inhibitor: an analysis of two randomised trials. Lancet 2009 Aug 31; 374(9694): 989–97

    PubMed  Google Scholar 

  90. Siller-Matula JM, Spiel AO, Lang IM, et al. Effects of pantoprazole and esomeprazole on platelet inhibition by clopidogrel. Am Heart J 2009 Jan; 157(1): 148 e1-5

    PubMed  Google Scholar 

  91. Angiolillo DJ, Gibson CM, Cheng S, et al. Differential effects of omeprazole and pantoprazole on the pharmacodynamics and pharmacokinetics of clopidogrel in healthy subjects: randomized, placebo-controlled, crossover comparison studies. Clin Pharmacol Ther 2011 Jan; 89(1): 65–74

    PubMed  CAS  Google Scholar 

  92. Steinhubl SR, Akers WS. Clopidogrel-statin interaction: a mountain or a mole hill? Am Heart J 2006 Aug; 152(2): 200–3

    PubMed  CAS  Google Scholar 

  93. Ho PM, Maddox TM, Wang L, et al. Risk of adverse outcomes associated with concomitant use of clopidogrel and proton pump inhibitors following acute coronary syndrome. JAMA 2009 Mar 4; 301(9): 937–44

    PubMed  CAS  Google Scholar 

  94. Juurlink DN, Gomes T, Ko DT, et al. A population-based study of the drug interaction between proton pump inhibitors and clopidogrel. CMAJ 2009 Jan 28; 180(7): 713–8

    PubMed  Google Scholar 

  95. Kreutz RP, Stanek EJ, Aubert R, et al. Impact of proton pump inhibitors on the effectiveness of clopidogrel after coronary stent placement: the clopidogrel medco outcomes study. Pharmacotherapy 2010 Aug; 30(8): 787–96

    PubMed  CAS  Google Scholar 

  96. Kwok CS, Loke YK. Meta-analysis: the effects of proton pump inhibitors on cardiovascular events and mortality in patients receiving clopidogrel. Aliment Pharmacol Ther 2010 Apr; 31(8): 810–23

    PubMed  CAS  Google Scholar 

  97. Bhatt DL, Cryer BL, Contant CF, et al. Clopidogrel with or without omeprazole in coronary artery disease. N Engl J Med 2010 Nov 11; 363(20): 1909–17

    PubMed  CAS  Google Scholar 

  98. Goodman SG, Clare R, Pieper KS, et al. Association of proton pump inhibitor use on cardiovascular outcomes with clopidogrel and ticagrelor: insights from the platelet inhibition and patient outcomes trial. Circulation 2012 Feb 28; 125(8): 978–86

    PubMed  CAS  Google Scholar 

  99. Abraham NS, Hlatky MA, Antman EM, et al. ACCF/ACG/AHA 2010 expert consensus document on the concomitant use of proton pump inhibitors and thienopyridines: a focused update of the ACCF/ACG/AHA 2008 expert consensus document on reducing the gastrointestinal risks of antiplatelet therapy and NSAID use. J Am Coll Cardiol 2010 Dec 7; 56(24): 2051–66

    PubMed  Google Scholar 

  100. Johansson I, Ingelman-Sundberg M. Genetic polymorphism and toxicology: with emphasis on cytochrome p450. Toxicol Sci 2011 Mar; 120(1): 1–13

    PubMed  CAS  Google Scholar 

  101. Wijnen PA, Op den Buijsch RA, Drent M, et al. Review article: the prevalence and clinical relevance of cytochrome P450 polymorphisms. Aliment Pharmacol Ther 2007 Dec; 26 Suppl. 2: 211–9

    PubMed  CAS  Google Scholar 

  102. Hulot JS, Bura A, Villard E, et al. Cytochrome P450 2C19 loss-of-function polymorphism is a major determinant of clopidogrel responsiveness in healthy subjects. Blood 2006 Oct 1; 108(7): 2244–7

    PubMed  CAS  Google Scholar 

  103. Giusti B, Gori AM, Marcucci R, et al. Cytochrome P450 2C19 loss-of-function polymorphism, but not CYP3A4 IVS10+12G/A and P2Y12 T744C polymorphisms, is associated with response variability to dual antiplatelet treatment in high-risk vascular patients. Pharmacogenet Genomics 2007 Dec; 17(12): 1057–64

    PubMed  CAS  Google Scholar 

  104. Frere C, Cuisset T, Morange PE, et al. Effect of cytochrome p450 polymorphisms on platelet reactivity after treatment with clopidogrel in acute coronary syndrome. Am J Cardiol 2008 Apr 15; 101(8): 1088–93

    PubMed  CAS  Google Scholar 

  105. Gladding P, Webster M, Zeng I, et al. The pharmacogenetics and pharmacodynamics of clopidogrel response: an analysis from the PRINC (Plavix Response in Coronary Intervention) trial. JACC Cardiovasc Interv 2008 Dec; 1(6): 620–7

    PubMed  Google Scholar 

  106. Trenk D, Hochholzer W, Fromm MF, et al. Cytochrome P450 2C19 681G>A polymorphism and high on-clopidogrel platelet reactivity associated with adverse 1-year clinical outcome of elective percutaneous coronary intervention with drug-eluting or bare-metal stents. J Am Coll Cardiol 2008 May 20; 51(20): 1925–34

    PubMed  CAS  Google Scholar 

  107. Shuldiner AR, O’Connell JR, Bliden KP, et al. Association of cytochrome P450 2C19 genotype with the antiplatelet effect and clinical efficacy of clopidogrel therapy. JAMA 2009 Aug 26; 302(8): 849–57

    PubMed  CAS  Google Scholar 

  108. Pare G, Mehta SR, Yusuf S, et al. Effects of CYP2C19 genotype on outcomes of clopidogrel treatment. N Engl J Med 2010 Oct 28; 363(18): 1704–14

    PubMed  CAS  Google Scholar 

  109. Sofi F, Giusti B, Marcucci R, et al. Cytochrome P450 2C19(*)2 polymorphism and cardiovascular recurrences in patients taking clopidogrel: a meta-analysis. Pharmacogenomics J 2011 Jun; 11(3): 199–206

    PubMed  CAS  Google Scholar 

  110. Wallentin L, James S, Storey RF, et al. Effect of CYP2C19 and ABCB1 single nucleotide polymorphisms on outcomes of treatment with ticagrelor versus clopidogrel for acute coronary syndromes: a genetic substudy of the PLATO trial. Lancet 2010 Oct 16; 376(9749): 1320–8

    PubMed  CAS  Google Scholar 

  111. Mega JL, Close SL, Wiviott SD, et al. Genetic variants in ABCB1 and CYP2C19 and cardiovascular outcomes after treatment with clopidogrel and prasugrel in the TRITON-TIMI 38 trial: a pharmacogenetic analysis. Lancet 2010 Oct 16; 376(9749): 1312–9

    PubMed  CAS  Google Scholar 

  112. Holmes Jr DR, Dehmer GJ, Kaul S, et al. ACCF/AHA clopidogrel clinical alert: approaches to the FDA “boxed warning”: a report of the American College of Cardiology Foundation Task Force on clinical expert consensus documents and the American Heart Association endorsed by the Society for Cardiovascular Angiography and Interventions and the Society of Thoracic Surgeons. J Am Coll Cardiol 2010 Jul 20; 56(4): 321–41

    PubMed  CAS  Google Scholar 

  113. Patti G, Pasceri V, Vizzi V, et al. Usefulness of platelet response to clopidogrel by point-of-care testing to predict bleeding outcomes in patients undergoing percutaneous coronary intervention (from the Antiplatelet Therapy for Reduction of Myocardial Damage During Angioplasty-Bleeding Study). Am J Cardiol 2011 Apr 1; 107(7): 995–1000

    PubMed  Google Scholar 

  114. Sibbing D, Schulz S, Braun S, et al. Antiplatelet effects of clopidogrel and bleeding in patients undergoing coronary stent placement. J Thromb Haemost 2010 Feb; 8(2): 250–6

    PubMed  CAS  Google Scholar 

  115. Sibbing D, Koch W, Gebhard D, et al. Cytochrome 2C19*17 allelic variant, platelet aggregation, bleeding events, and stent thrombosis in clopidogreltreated patients with coronary stent placement. Circulation 2010 Feb 2; 121(4): 512–8

    PubMed  CAS  Google Scholar 

  116. Aleil B, Jacquemin L, De Poli F, et al. Clopidogrel 150 mg/day to overcome low responsiveness in patients undergoing elective percutaneous coronary intervention: results from the VASP-02 (Vasodilator-Stimulated Phosphoprotein-02) randomized study. JACC Cardiovasc Interv 2008 Dec; 1(6): 631–8

    PubMed  Google Scholar 

  117. Bonello L, Camoin-Jau L, Armero S, et al. Tailored clopidogrel loading dose according to platelet reactivity monitoring to prevent acute and subacute stent thrombosis. Am J Cardiol 2009 Jan 1; 103(1): 5–10

    PubMed  CAS  Google Scholar 

  118. Bonello L, Camoin-Jau L, Arques S, et al. Adjusted clopidogrel loading doses according to vasodilator-stimulated phosphoprotein phosphorylation index decrease rate of major adverse cardiovascular events in patients with clopidogrel resistance: a multicenter randomized prospective study. J Am Coll Cardiol 2008 Apr 8; 51(14): 1404–11

    PubMed  CAS  Google Scholar 

  119. Neubauer H, Lask S, Engelhardt A, et al. How to optimise clopidogrel therapy? Reducing the low-response incidence by aggregometry-guided therapy modification. Thromb Haemost 2008 Feb; 99(2): 357–62

    PubMed  CAS  Google Scholar 

  120. Aradi D, Vorobcsuk A, Pinter T, et al. Doubling the maintenance dose of clopidogrel in patients with high post-clopidogrel platelet reactivity after percutaneous coronary intervention: the DOSER randomized, placebo-controlled trial. Eur Heart J 2010; 31 (abstract Suppl.): 970

    Google Scholar 

  121. Neubauer H, Kaiser AF, Endres HG, et al. Tailored antiplatelet therapy can overcome clopidogrel and aspirin resistance: The BOchum CLopidogrel and Aspirin Plan (BOCLA-Plan) to improve antiplatelet therapy. BMC Med 2011; 9(1): 3

    PubMed  CAS  Google Scholar 

  122. Price MJ, Berger PB, Teirstein PS, et al. Standard- vs high-dose clopidogrel based on platelet function testing after percutaneous coronary intervention: the GRAVITAS randomized trial. JAMA 2011 Mar 16; 305(11): 1097–105

    PubMed  CAS  Google Scholar 

  123. Storey RF, Wilcox RG, Heptinstall S. Comparison of the pharmacodynamic effects of the platelet ADP receptor antagonists clopidogrel and AR-C69931MX in patients with ischaemic heart disease. Platelets 2002 Nov; 13(7): 407–13

    PubMed  CAS  Google Scholar 

  124. Storey RF, Husted S, Harrington RA, et al. Inhibition of platelet aggregation by AZD6140, a reversible oral P2Y12 receptor antagonist, compared with clopidogrel in patients with acute coronary syndromes. J Am Coll Cardiol 2007 Nov 6; 50(19): 1852–6

    PubMed  CAS  Google Scholar 

  125. Wallentin L, Varenhorst C, James S, et al. Prasugrel achieves greater and faster P2Y12receptor-mediated platelet inhibition than clopidogrel due to more efficient generation of its active metabolite in aspirin-treated patients with coronary artery disease. Eur Heart J 2008 Jan; 29(1): 21–30

    PubMed  CAS  Google Scholar 

  126. Wiviott SD, Trenk D, Frelinger AL, et al. Prasugrel compared with high loading- and maintenance-dose clopidogrel in patients with planned percutaneous coronary intervention: the Prasugrel in Comparison to Clopidogrel for Inhibition of Platelet Activation and Aggregation-Thrombolysis in Myocardial Infarction 44 trial. Circulation 2007 Dec 18; 116(25): 2923–32

    PubMed  CAS  Google Scholar 

  127. Gurbel PA, Bliden KP, Butler K, et al. Response to ticagrelor in clopidogrel nonresponders and responders and effect of switching therapies: the RESPOND study. Circulation 2010 Mar 16; 121(10): 1188–99

    PubMed  CAS  Google Scholar 

  128. Greenbaum AB, Grines CL, Bittl JA, et al. Initial experience with an intravenous P2Y12 platelet receptor antagonist in patients undergoing percutaneous coronary intervention: results from a 2-part, phase II, multicenter, randomized, placebo- and active-controlled trial. Am Heart J 2006 Mar; 151(3): 689 e1-e10

    PubMed  CAS  Google Scholar 

  129. Greenbaum AB, Ohman EM, Gibson CM, et al. Preliminary experience with intravenous P2Y12 platelet receptor inhibition as an adjunct to reduced-dose alteplase during acute myocardial infarction: results of the Safety, Tolerability and Effect on Patency in Acute Myocardial Infarction (STEP-AMI) angiographic trial. Am Heart J 2007 Oct; 154(4): 702–9

    PubMed  CAS  Google Scholar 

  130. Bhatt DL, Lincoff AM, Gibson CM, et al. Intravenous platelet blockade with cangrelor during PCI. N Engl J Med 2009 Dec 10; 361(24): 2330–41

    PubMed  CAS  Google Scholar 

  131. Harrington RA, Stone GW, McNulty S, et al. Platelet inhibition with cangrelor in patients undergoing PCI. N Engl J Med 2009 Dec 10; 361(24): 2318–29

    PubMed  CAS  Google Scholar 

  132. Wiviott SD, Braunwald E, McCabe CH, et al. Prasugrel versus clopidogrel in patients with acute coronary syndromes. N Engl J Med 2007 Nov 4; 357(20): 2001–15

    PubMed  CAS  Google Scholar 

  133. Montalescot G, Wiviott SD, Braunwald E, et al. Prasugrel compared with clopidogrel in patients undergoing percutaneous coronary intervention for ST-elevation myocardial infarction (TRITON-TIMI 38): double-blind, randomised controlled trial. Lancet 2009 Feb 28; 373(9665): 723–31

    PubMed  CAS  Google Scholar 

  134. Wiviott SD, Braunwald E, Angiolillo DJ, et al. Greater clinical benefit of more intensive oral antiplatelet therapy with prasugrel in patients with diabetes mellitus in the trial to assess improvement in therapeutic outcomes by optimizing platelet inhibition with prasugrel — Thrombolysis in Myocardial Infarction 38. Circulation 2008 Oct 14; 118(16): 1626–36

    PubMed  CAS  Google Scholar 

  135. Wiviott SD, Braunwald E, McCabe CH, et al. Intensive oral antiplatelet therapy for reduction of ischaemic events including stent thrombosis in patients with acute coronary syndromes treated with percutaneous coronary intervention and stenting in the TRITON-TIMI 38 trial: a subanalysis of a randomised trial. Lancet 2008 Apr 19; 371(9621): 1353–63

    PubMed  CAS  Google Scholar 

  136. Mega JL, Close SL, Wiviott SD, et al. Cytochrome P450 genetic polymorphisms and the response to prasugrel: relationship to pharmacokinetic, pharmacodynamic, and clinical outcomes. Circulation 2009 May 19; 119(19): 2553–60

    PubMed  CAS  Google Scholar 

  137. Schror K, Siller-Matula JM, Huber K. Pharmacokinetic basis of the antiplatelet action of prasugrel. Fundam Clin Pharmacol 2012 Feb; 26(1): 39–46

    PubMed  Google Scholar 

  138. Wallentin L, Becker RC, Budaj A, et al. Ticagrelor versus clopidogrel in patients with acute coronary syndromes. N Engl J Med 2009 Sep 10; 361(11): 1045–57

    PubMed  CAS  Google Scholar 

  139. AstraZeneca. AstraZeneca replies to the US FDA complete response letter for BRILINTA (ticagrelor tablets) [media release]. 2011 Jan 21 [online]. Available from URL: http://www.astrazeneca.com/Media/Press-releases/Article/20110121CRL-to-US-FDA-for-Brilinta. [Accessed 2012 May 8]

  140. Serebruany VL. Aspirin dose and ticagrelor benefit in PLATO: fact or fiction? Cardiology 2010; 117(4): 280–3

    PubMed  CAS  Google Scholar 

  141. Serebruany VL. Adenosine release: a potential explanation for the benefits of ticagrelor in the PLATelet inhibition and clinical outcomes trial? Am Heart J 2011 Jan; 161(1): 1–4

    PubMed  CAS  Google Scholar 

  142. Brandt JT, Payne CD, Wiviott SD, et al. A comparison of prasugrel and clopidogrel loading doses on platelet function: magnitude of platelet inhibition is related to active metabolite formation. Am Heart J 2007 Jan; 153(1): 66 e9-16

    PubMed  CAS  Google Scholar 

  143. Feldman M, Jialal I, Devaraj S, et al. Effects of low-dose aspirin on serum C-reactive protein and thromboxane B2 concentrations: a placebo-controlled study using a highly sensitive C-reactive protein assay. J Am Coll Cardiol 2001 Jun 15; 37(8): 2036–41

    PubMed  CAS  Google Scholar 

  144. Klinkhardt U, Graff J, Harder S. Clopidogrel, but not abciximab, reduces platelet leukocyte conjugates and P-selectin expression in a human ex vivo in vitro model. Clin Pharmacol Ther 2002 Mar; 71(3): 176–85

    PubMed  CAS  Google Scholar 

Download references

Acknowledgments

This manuscript was written and edited by the authors, who take full responsibility for its content. Editorial assistance with searching the literature, coordinating revisions, and creating figures and tables in preparation of this manuscript was provided by Susan Abulhawa and Melanie Leiby, PhD, of inScience Communications, Springer Healthcare, and funded by the Bristol-Myers Squibb/Sanofi Pharmaceutical Partnership. The authors did not receive any compensation for this work.

Saihari Sadanandan, MD, has served as a consultant and on the speaker’s bureau for Bristol-Myers Squibb and sanofi-aventis. Dr Sadanandan has also served on the speaker’s bureau for Daiichi Sankyo, Inc., Eli Lilly and Company, and Schering-Plough.

Inder M. Singh, MD, reports no conflicts of interest.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Saihari Sadanandan.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Sadanandan, S., Singh, I.M. Clopidogrel. Am J Cardiovasc Drugs 12, 361–374 (2012). https://doi.org/10.1007/BF03262471

Download citation

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF03262471

Keywords

Navigation