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Aspirin plus warfarin compared to aspirin alone after acute coronary syndromes: an updated and comprehensive meta-analysis of 25,307 patients Andreotti F; Testa L; Biondi-Zoccai GG; Crea FEur Heart J 2006[Mar]; 27 (5): 519-26AIMS: In patients recovering from acute coronary syndromes (ACS) the role of oral anticoagulation (and its intensity) in addition to aspirin remains controversial. We conducted a specific meta-analysis of randomized trials comparing aspirin plus warfarin (A+W) with aspirin alone in such patients. METHODS AND RESULTS: MEDLINE and Cochrane databases yielded 14 (of 148 potentially relevant) articles enrolling 25 307 patients. Follow-up ranged from 3 months to 5 years. Irrespective of International normalized ratio (INR), A+W did not significantly affect the risk of major adverse events (MAE: all cause death, non-fatal myocardial infarction, and non-fatal thrombo-embolic stroke) when compared with aspirin alone [OR 0.96 (0.90-1.03), P=0.30], but increased the risk of major bleeds (MB): OR 1.77 (1.47-2.13), P<0.00001. However, in studies with INR of 2-3, A+W was associated with a significant reduction of MAE [OR 0.73 (0.63-0.84), P<0.0001, number needed to treat to avoid one MAE=33], albeit at an increased risk of MB [OR 2.32 (1.63-3.29), P<0.00001; number needed to harm by causing one MB=100]. In both analyses, intracranial bleeding was not significantly increased by A+W when compared with aspirin alone. CONCLUSION: For patients recovering from ACS, a combined strategy of A+W at INR values of 2-3 doubles the risk of MB, but is nonetheless superior to aspirin alone in preventing MAE. Whether this combined regimen is also superior to a 'double' anti-platelet strategy or to newer evolving treatments warrants further investigation.|Angina, Unstable/*drug therapy[MESH]|Anticoagulants/*therapeutic use[MESH]|Aspirin/*therapeutic use[MESH]|Drug Therapy, Combination[MESH]|Humans[MESH]|Myocardial Infarction/*drug therapy[MESH]|Platelet Aggregation Inhibitors/*therapeutic use[MESH]|Randomized Controlled Trials as Topic[MESH]|Treatment Outcome[MESH]|Warfarin/*therapeutic use[MESH] |
