Abstract 3286: Low Response to Clopidogrel is Associated With Cardiovascular Outcome after Coronary Stent Implantation
Aims. To assess whether low response to clopidogrel influences cardiovascular outcome after coronary stent implantation in a consecutively measured cohort of patients with coronary stent implantation.
Methods and Results. A total of 379 consecutive patients with symptomatic coronary artery disease (CAD), (stable angina n=206; acute coronary syndrome, n=173) treated with percutaneous coronary stenting were enrolled in this trial. Responsiveness to clopidogrel was assessed by ADP (20μmol/L)-induced aggregometry at least 6h (mean 34.8h±25.9h) after administration of a loading dose of 600-mg clopidogrel. Platelet inhibition less than 30% was defined as low response to clopidogrel. At 3-month follow-up the primary outcome of a combined major cardiovascular event including nonfatal myocardial infarction, nonfatal ischaemic stroke, or cardiovascular death was evaluated. Twenty-two patients (5.8%) were classified as low responders. Compared with patients that adequately responded to clopidogrel, a low responder had a significantly higher risk of major cardiovascular events (22.7% versus 5.6%;Odds Ratio, 4.9; 95% confidence interval (CI), 1.66 to 14.96, p<0.05). After adjustment for other factors influencing cardiovascular outcome low response to clopidogrel and severe left ventricular dysfunction were independently associated with a major cardiovascular event within 3 months (Hazard Ratio for low response to clopidogrel, 3.71; 95% CI, 1.17 to 12.69; P<0.05).
Conclusion. Low response to clopidogrel in patients with symptomatic CAD treated by stenting significantly enhances the occurrence of cardiovascular events and death. The evaluation of low response to clopidogrel may help to identify patients at increased risk who may benefit from intensified antiplatelet strategy.