Key result
Combined OAC and antiplatelets cut embolism ~67% after mechanical valve replacement but increase GI hemorrhage.
Why the study?
Does combined oral anticoagulant and antiplatelet therapy reduce embolism and mortality compared to oral anticoagulant monotherapy in patients after mechanical heart-valve replacement?
Meta-Analysis
Does combined oral anticoagulant and antiplatelet therapy reduce embolism and mortality compared to oral anticoagulant monotherapy in patients after mechanical heart-valve replacement?
Odds Ratio: 0.33 (95% CI 0.16–0.69)
p-value: p=0.0032
In patients with mechanical heart valves, adding antiplatelet therapy to oral anticoagulation significantly reduces embolic events but substantially increases the risk of major gastrointestinal bleeding.
May warrant monotherapy preference to limit GI bleeding after mechanical valve replacement; extends evidence for individualized antithrombotic decisions.
We performed a metaanalysis of five randomized controlled trials to compare the efficacy and safety of combined oral anticoagulant and antiplatelet therapy versus oral anticoagulants alone after prosthetic heart-valve replacement. The combined regimen reduced embolism and overall mortality by approximately 67% (pooled odds ratio [OR] 0.33; 95% confidence interval [CI] 0.16 to 0.69; p = 0.0032) and 40% (OR 0.60; 95% CI 0.32 to 1.12; p = 0.11), respectively, but increased the risk of hemorrhage by approximately 65% (OR 1.65; 95% CI 1.15 to 2.39; p = 0.0069) and of major gastrointestinal hemorrhage by approximately 250% (OR 3.47; 95% CI 1.43 to 8.40; p = 0.0058). It is estimated that for every 1.6 patients who had their stroke prevented by combination therapy, there was an excess of one major gastrointestinal bleed. This metaanalysis suggests that the benefits derived from the enhanced antithrombotic potential of combined therapy outweigh the toxic effects resulting from the enhanced anticoagulant potential of this regimen.
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Cappelleri et al. (1995) conducted a meta-analysis in prosthetic heart-valve replacement. Combined oral anticoagulant and antiplatelet therapy vs. Oral anticoagulants alone was evaluated on Embolism (OR 0.33, 95% CI 0.16 to 0.69, p=0.0032). Combined oral anticoagulant and antiplatelet therapy after mechanical heart-valve replacement reduced embolism (OR 0.33; 95% CI 0.16-0.69) but increased major GI hemorrhage (OR 3.47; 95% CI 1.43-8.40).
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