High residual platelet reactivity after clopidogrel loading and long-term clinical outcome after drug-eluting stenting for unprotected left main coronary disease

Circulation
Angela MiglioriniDavid Antoniucci

Abstract

No data exist about the impact of high residual platelet reactivity (HRPR) after clopidogrel loading on long-term clinical outcome in patients undergoing drug-eluting stent (DES) implantation for unprotected left main disease (ULMD). Consecutive patients who underwent percutaneous coronary intervention for ULMD had prospective platelet reactivity assessment by light transmittance aggregometry after a loading dose of 600 mg of clopidogrel. The primary end point of the study was cardiac mortality, and the secondary end point was stent thrombosis. From January 2005 to September 2008, 215 consecutive patients were treated with DES for ULMD. The incidence of HRPR after clopidogrel loading was 18.6%. The median follow-up was 19.3 months. The overall estimated 1-, 2- and 3-year cardiac mortality rate was 3.9+/-1.3%, 7.5+/-2.2%, and 12.2+/-3.4%, respectively. The 3-year cardiac mortality rate was 8.0+/-3.1% in the low residual platelet reactivity (LRPR) group and 28.3+/-10.4% in the HRPR group (P=0.005). The 3-year stent thrombosis rate was 4.2+/-1.8% in the low residual platelet reactivity group and 16.0+/-7.3% in the HRPR group (P=0.021). By forward stepwise regression analysis, HRPR after clopidogrel loading was the only independent...Continue Reading

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