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Original Article
Published at www.nejm.org February 12, 2007 (10.1056/NEJMoa067731)

Stent Thrombosis in Randomized Clinical Trials of Drug-Eluting Stents
Laura Mauri, M.D., Wen-hua Hsieh, Ph.D., Joseph M. Massaro, Ph.D., Kalon K.L. Ho, M.D., Ralph D'Agostino, Ph.D., and Donald E. Cutlip, M.D.

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ABSTRACT

Background Definitions of stent thrombosis that have been used in clinical trials of drug-eluting stents have been restrictive and have not been used in a uniform manner.

Methods We applied a hierarchical classification of stent thrombosis set by the Academic Research Consortium (ARC) across randomized trials involving 878 patients treated with sirolimus-eluting stents, 1400 treated with paclitaxel-eluting stents, and 2267 treated with bare-metal stents. We then pooled 4 years of follow-up data. All events were adjudicated by an independent clinical-events committee.

Results The cumulative incidence of stent thrombosis according to the original protocol definitions was 1.2% in the sirolimus-stent group versus 0.6% in the bare-metal-stent group (P=0.20; 95% confidence interval [CI], -0.4 to 1.5) and 1.3% in the paclitaxel-stent group versus 0.8% in the bare-metal-stent group (P=0.24; 95% CI, -0.3 to 1.4). The incidence of definite or probable stent thrombosis as defined by the ARC was 1.5% in the sirolimus-stent group versus 1.7% in the bare-metal-stent group (P=0.70; 95% CI, -1.5 to 1.0) and 1.8% in the paclitaxel-stent group versus 1.4% in the bare-metal-stent group (P=0.52; 95% CI, -0.7 to 1.4). The incidence of definite or probable events occurring 1 to 4 years after implantation was 0.9% in the sirolimus-stent group versus 0.4% in the bare-metal-stent group and 0.9% in the paclitaxel-stent group versus 0.6% in the bare-metal-stent group.

Conclusions The incidence of stent thrombosis did not differ significantly between patients with drug-eluting stents and those with bare-metal stents in randomized clinical trials, although the power to detect small differences in rates was limited.

Notice: This article was published at www.nejm.org on February 12, 2007. It will appear in the March 8 issue of the Journal.

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