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To perform a systematic literature review and indirect treatment comparison (ITC) to identify, summarize and quantify randomized controlled trial (RCT) evidence evaluating combination anticoagulant or P2Y12 inhibitor with low-dose aspirin versus low-dose aspirin alone for the prevention of atherothrombotic events in patients with stable coronary artery disease (CAD) and/or peripheral artery disease (PAD). We performed an updated search of CENTRAL, MEDLINE and EMBASE through 23 August 2021 to identify RCTs of adult patients with chronic CAD and/or PAD that compared combination anticoagulant or P2Y12 inhibitor with low-dose aspirin to low-dose aspirin alone. Outcomes of interest included major adverse cardiovascular events (MACEs) including cardiovascular death, stroke, or myocardial infarction (MI) and bleeding. When needed, outcomes were pooled using random-effects models to generate hazard or risk ratios (HRs or RRs) and accompanying 95% confidence intervals (CIs). Adjusted ITCs using subsequent pooled HRs/RRs were then performed. Six publications reporting the results of two unique RCTs (one evaluating clopidogrel + aspirin vs. aspirin alone and the other rivaroxaban 2.5 mg twice daily + aspirin vs. aspirin alone) were analyzed. The ITC suggested that rivaroxaban + aspirin was associated with a lower risk of MACEs compared with clopidogrel + aspirin (HR = 0.82, 95% CI = 0.68–0.98). When looking at the individual components of MACE, rivaroxaban + aspirin was associated with lower risk of cardiovascular death (HR = 0.75, 95% CI = 0.57–0.98) and stroke (RR = 0.67, 95 CI = 0.49–0.93) and similar risk of MI (RR = 0.93, 95% CI = 0.70–1.23) versus clopidogrel + aspirin. No evidence of a difference in moderate-to-severe bleeding, fatal bleeding or intracranial hemorrhage (ICH) was seen between the two treatment strategies. Compared to clopidogrel + low-dose aspirin, the use of rivaroxaban 2.5 mg twice daily + low-dose aspirin reduced the risk of MACE, CV death and stroke including ischemic stroke in patients with or at high risk for chronic CAD and/or PAD. These benefits of rivaroxaban 2.5 mg twice daily + low-dose aspirin compared to clopidogrel + low-dose aspirin appear to be achieved without significantly increasing patients’ risk of moderate-to-severe bleeding, including ICH or fatal bleeding.

current medical research and opinion

Combination anticoagulant or P2Y12 inhibitor with low-dose aspirin versus low-dose aspirin alone in patients at risk or with documented coronary and/or peripheral artery disease