How safe is clopidogrel and aspirin in patients with atrial fibrillation (Afib) (AF)?

Updated: Nov 18, 2019
  • Author: Lawrence Rosenthal, MD, PhD, FACC, FHRS; Chief Editor: Jeffrey N Rottman, MD  more...
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Answer

In patients unable to take warfarin, the addition of clopidogrel to aspirin was shown to reduce the risk of major vascular events, especially stroke, when compared with placebo and aspirin in the ACTIVE (Atrial Fibrillation Clopidogrel Trial with Irbesartan for Prevention of Vascular Events) trial; however, increased risk for major hemorrhage was more prevalent in the clopidogrel plus aspirin group than the placebo and aspirin group. The ACTIVE trial studied 7554 patients with AF with the intent to determine whether adding clopidogrel to aspirin therapy would reduce the risk for acute vascular events (ie, stroke, myocardial infarction [MI], non-central nervous system [CNS] systemic embolism, or death from vascular event). [159]

In another study, among AF patients treated with concomitant aspirin and oral anticoagulation, there was also a significantly increased risk for bleeding. [63] Hospitalizations for bleeding events were also increased in those receiving this treatment combination.

Clopidogrel has been suggested to be less effective in reducing the rate of cardiovascular events in individuals who carry the loss-of-function CYP2C19 alleles. However, a 2010 study concluded that patients with acute coronary syndromes or AF respond well to clopidogrel, regardless of CYP2C19 loss-of-function carrier status. [160]


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