Concomitant use of clopidogrel and proton pump inhibitors is not associated with major adverse cardiovascular events following coronary stent implantation
Article first published online: 4 NOV 2011
© 2011 Blackwell Publishing Ltd
Alimentary Pharmacology & Therapeutics
Volume 35, Issue 1, pages 165–174, January 2012
How to Cite
Schmidt, M., Johansen, M. B., Robertson, D. J., Maeng, M., Kaltoft, A. , Jensen, L. O., Tilsted, H.-H., Bøtker, H. E., Sørensen, H. T. and Baron, J. A. (2012), Concomitant use of clopidogrel and proton pump inhibitors is not associated with major adverse cardiovascular events following coronary stent implantation. Alimentary Pharmacology & Therapeutics, 35: 165–174. doi: 10.1111/j.1365-2036.2011.04890.x
- Issue published online: 9 DEC 2011
- Article first published online: 4 NOV 2011
- Publication data Submitted 28 August 2011 First decision 15 September 2011 Resubmitted 22 September 2011 Accepted 25 September 2011 EV Pub Online 4 November 2011
Aliment Pharmacol Ther 2012; 35: 165–174
Background Cytochrome P450 inhibition by proton pump inhibitors (PPIs) may attenuate the effectiveness of clopidogrel.
Aim To examine whether PPI use modifies the association between clopidogrel use and major adverse cardiovascular events (MACE) after percutaneous coronary intervention (PCI) with stent implantation, using time-varying drug exposure ascertainment.
Methods We conducted this population-based cohort study in Western Denmark (population 3 million) using medical databases. We identified all 13 001 patients with coronary stent implantation between 2002 and 2005 and ascertained their reported comorbidities. During the recommended 12-month postintervention treatment period, we tracked use of clopidogrel and PPI and the rate of MACE. We used Cox regression to compute hazard ratios (HRs), controlling for potential confounders.
Results During follow-up, one or more prescriptions were redeemed by 91% of patients for clopidogrel and by 21% of patients for PPIs. Of the patients, 15% experienced a MACE. The adjusted HR for MACE comparing clopidogrel use with non-use was 0.57 [95% confidence interval (CI): 0.44–0.74] among PPI users and 0.47 (95% CI: 0.42–0.53) among PPI non-users, yielding an interaction effect (i.e. relative rate increase) of 1.20 (95% CI: 0.91–1.58). PPI users treated from before PCI had a 25% increased rate of MACE compared to PPI non-users, independent of clopidogrel use [adjusted HR = 1.24 (95% CI: 0.97–1.58) for clopidogrel users and 1.26 (95% CI: 0.97–1.63) for clopidogrel non-users].
Conclusions The use of PPIs as a class did not modify the protective effect of clopidogrel, but its use was associated with major adverse cardiovascular events itself, particularly among patients having used PPIs before percutaneous coronary intervention.