A randomized, placebo-controlled trial of enoxaparin after high-risk coronary stenting: the ATLAST trial.


Journal Article

OBJECTIVES: We performed a multicenter, double-blind placebo-controlled trial to examine the efficacy and safety of enoxaparin in patients at high risk for stent thrombosis (ST). BACKGROUND: The optimal antithrombotic regimen for such patients is unknown. METHODS: We randomized 1,102 patients with clinical, angiographic or ultrasonographic features associated with an increased risk of ST to receive either twice-daily injections of weight-adjusted enoxaparin or placebo for 14 days after stenting. All patients received aspirin and ticlopidine. The primary end point was a 30-day composite end point of death, myocardial infarction (MI) or urgent revascularization. RESULTS: The target enrollment for the study was 2,000 patients. However, the trial was terminated prematurely at 1,102 patients after interim analysis revealed an unexpectedly low event rate. The primary outcome occurred in 1.8% enoxaparin-treated patients versus 2.7% treated with placebo (odds ratio [OR] 0.66; 95% confidence interval [CI] 0.29 to 1.5, p = 0.30); for death or MI the rates were 0.9% vs. 2.2%, respectively (OR 0.41, 95% CI 0.14 to 1.2, p =0.13); and for MI, 0.4% vs. 1.6%, respectively (OR 0.22, 95% CI 0.05 to 0.99, p = 0.04). The groups had comparable rates of major bleeding (3.3% for enoxaparin, 1.6% for placebo, p =0.08), but minor nuisance bleeding was increased with enoxaparin (25% vs. 5.1%, p < 0.001). CONCLUSIONS: The clinical outcomes of patients at increased risk of ST are more favorable than previously reported, rendering routine oral antiplatelet therapy adequate for most. However, given its relative safety and potential to reduce the risk of subsequent infarction, a 14-day course of enoxaparin may be considered for carefully selected patients.

Full Text

Duke Authors

Cited Authors

  • Batchelor, WB; Mahaffey, KW; Berger, PB; Deutsch, E; Meier, S; Hasselblad, V; Fry, ET; Teirstein, PS; Ross, AM; Binanay, CA; Zidar, JP; ATLAST Trial Investigators,

Published Date

  • November 15, 2001

Published In

Volume / Issue

  • 38 / 6

Start / End Page

  • 1608 - 1613

PubMed ID

  • 11704394

Pubmed Central ID

  • 11704394

International Standard Serial Number (ISSN)

  • 0735-1097

Digital Object Identifier (DOI)

  • 10.1016/s0735-1097(01)01612-6


  • eng

Conference Location

  • United States