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DRUG INFORMATION ROUNDS

Single Antiplatelet Therapy for Patients with Previous Gastrointestinal Bleeds

PharmD Student, Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada

Margaret L Ackman, PharmD ACPR

Clinical Practice Leader, Regional Pharmacy Services, Capital Health, Edmonton, Alberta, Canada

Reprints: Dr. Ackman, Regional Pharmacy Services, Capital Health, 0G1.01 WMC 8440-112 St., Edmonton, AL, Canada T6G 2B7, fax 780/407-7690, margaret.ackman{at}capitalhealth.ca

OBJECTIVE: To determine whether aspirin plus a proton pump inhibitor (PPI) is preferable, from a gastrointestinal bleed (GIB) risk perspective, to clopidogrel in patients who have experienced a GIB while on aspirin and who require single antiplatelet therapy for secondary prevention of cardiovascular disease.

DATA SOURCES: A literature search was conducted using EMBASE (1980–January 2008), PubMed (1966–January 2008), Google, and a manual search of the reference lists using the search terms gastrointestinal bleed, gastrointestinal hemorrhage, peptic ulcer hemorrhage, ASA, aspirin, Plavix, clopidogrel, and PPI. The search, limited to human and English studies, yielded 110 returns.

STUDY SELECTION AND DATA EXTRACTION: Randomized trials that compared aspirin with clopidogrel, involved patients who had previously experienced a GIB, and provided detailed information on the type and dose of drugs used were included. Studies were required to provide information on the recurrence of GIB.

DATA SYNTHESIS: Two randomized trials were reviewed to assess the safety of secondary prevention of cardiovascular disease with respect to previous GIB. These noninferiority trials compared aspirin plus a PPI with clopidogrel over 12 months following confirmed healing of an aspirin-induced ulcer. In both trials, the majority of the GIB recurrences were in the clopidogrel group (8.6% vs 0.7%; difference 7.9%; 95% CI 3.4 to 12.4; p = 0.001 and 13.6% vs 0%; difference 13.6%; 95% CI 6.3 to 20.9; p = 0.0019) and the difference in recurrence rates exceeded the a priori selected upper boundary.

CONCLUSIONS: Findings reported in the limited literature available support that clopidogrel is not equivalent to the combination of aspirin plus a PPI in the patient population studied. Aspirin plus a PPI would be considered clinically superior and should be used in medically managed patients who require single antiplatelet therapy but have had a prior GIB while on aspirin. Further research regarding dual antiplatelet therapy and a PPI is required.

Key Words: aspirin, clopidogrel, gastrointestinal bleed, proton pump inhibitor

Published Online, April 15, 2008. www.theannals.com, DOI 10.1345/aph.1K566