Thromboembolism is a significant complication after the Fontan procedure because of endothelial dysfunction, abnormal blood flow, and hypercoagulability. This is the reason why it is recommended for these patients to receive thromboprophylaxis. The aim of our study was to compare the efficacy and safety of antiplatelets versus anticoagulants in patients with a history of a Fontan procedure. A systematic literature review was performed on the electronic databases PubMed, Cochrane, and Scopus, and the grey literature for retrieving studies comparing antiplatelets with anticoagulants and/or no medication on patients with Fontan circulation. We used the random effect model for synthesizing the data. A total of 26 and 20 studies were included in the qualitative and quantitative analysis, respectively. No difference was observed between antiplatelets and anticoagulants in the rate of thromboembolic events [odds ratio (OR), 1.47; 95% confidence interval (CI), 0.66-3.26]. Anticoagulants were more effective than no medication for thromboprophylaxis (OR, 0.17; 95% CI, 0.05-0.61), while comparison between antiplatelets and no medication showed no difference in thromboembolic episodes (OR, 0.25; 95% CI, 0.06-1.09). Antiplatelets were safer than anticoagulants with regards to any bleeding episodes (OR, 0.57; 95% CI, 0.34-0.95). In conclusion, no difference could be found between antiplatelets and anticoagulants in terms of efficacy. However, antiplatelets seem to be safer, as they are responsible for fewer bleeding events. Additional randomized controlled trials are needed to produce robust results.
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