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Giuseppe Ambrosio, Steven Steinhubl, Paolo Gresele, Isabella Tritto, Cinzia Zuchi, Michel E Bertrand, A Michael Lincoff, Jeffrey W Moses, Erik M Ohman, Harvey D White, Roxana Mehran, Gregg W Stone, Impact of chronic antiplatelet therapy before hospitalization on ischemic and bleeding events in invasively managed patients with acute coronary syndromes: the ACUITY trial, European journal of cardiovascular prevention and rehabilitation, Volume 18, Issue 1, 1 February 2011, Pages 121–128, https://doi.org/10.1097/HJR.0b013e32833bc070
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Abstract
Presentation with an acute coronary syndrome (ACS) on chronic aspirin therapy is an independent predictor of adverse short-term outcomes. Whether this finding applies to chronic thienopyridine use, and with the contemporary invasive management of ACS, is unknown.
In ACUITY, 13819 patients with moderate and high-risk ACS were studied; patients transferred from an outside hospital were excluded from the present analysis, given uncertain preadmission antiplatelet status. Endpoints included major adverse cardiovascular events (MACE: death, myocardial infarction, or unplanned revascularization), major bleeding, and net adverse clinical events (NACE). Among 11313 study patients, 31 % were naive for antiplatelet agent, 49% were receiving aspirin alone, and 20% were on dual antiplatelet therapy. Chronic antiplatelet users were older and had a higher risk profile. After adjusting for baseline differences, chronic antiplatelet therapy (single or dual) was not associated with an increased incidence of 30-day MACE, bleeding, or NACE. However, patients on chronic aspirin or dual antiplatelet therapy at presentation had significantly higher 1-year rates of MACE [odds ratio (95% confidence interval) = 1.17 (1.01–1.36), P = 0.03 and 1.29 (1.02–1.64), P = 0.03, respectively]. Patients presenting on dual antiplatelet therapy had significantly greater adjusted MACE at 1-year than those on aspirin alone [odds ratio (95% confidence interval) = 1.34 (1.15–1.56), P < 0.0001].
Contrary to earlier studies, prior antiplatelet therapy was not associated with an increased risk of adverse outcomes at 30 days in invasively managed patients. Such use did, however, independently predict 1-year ischemic MACE, with outcomes worse for patients presenting on chronic dual antiplatelet therapy compared with aspirin alone.
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