Investigation of an interaction between statins and clopidogrel after percutaneous coronary intervention: a cohort study.

Abstract:

BACKGROUND:Clopidogrel is an antiplatelet drug that is prescribed after percutaneous coronary intervention (PCI) to prevent stent thrombosis. Previous studies have suggested that some statins may inhibit the antiplatelet effects of clopidogrel via competitive metabolism of its activating enzyme cytochrome P450 3A4 (CYP3A4). OBJECTIVES:To investigate a possible interaction between statins and clopidogrel after a PCI procedure in a population-based cohort study. METHODS:A population-based cohort study was carried out between January 2001 and December 2004 using the health insurance databases from Quebec, Canada. The primary endpoint was a composite of death from any cause, myocardial infarction (MI), unstable angina, repeat revascularization and cerebrovascular events. PCI patients >or= 66 years of age were followed from their initial post-discharge clopidogrel prescription until the earliest of study endpoint occurrence, end of clopidogrel exposure or end of study (90 days post discharge). Time-dependent Cox regression analysis was performed. RESULTS:We identified 10491 patients who were prescribed clopidogrel post-PCI and 43.5% were also prescribed statins at the baseline discharge. During 1793 patient years of follow-up, 623 composite endpoints were observed. Compared to the reference group (non-CYP3A4-metabolized statins), the co-prescription of CYP3A4-metabolized statins (hazard ratio (HR) 1.16, 95% confidence interval (CI) 0.91-1.47), or no statin use (HR 1.22, 95%CI 0.93-1.59) were not statistically associated with an increase in adverse outcomes. CONCLUSIONS:In this PCI cohort, the association of clopidogrel with CYP3A4-metabolized statins did not demonstrate an increased early risk of adverse cardiovascular events, although a small risk could not be completely excluded.

authors

Blagojevic A,Delaney JA,Lévesque LE,Dendukuri N,Boivin JF,Brophy JM

doi

10.1002/pds.1716

subject

Has Abstract

pub_date

2009-05-01 00:00:00

pages

362-9

issue

5

eissn

1053-8569

issn

1099-1557

journal_volume

18

pub_type

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