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Aims To investigate the effects of aspirin-omitted dual antithrombotic therapy (DAT) on myocardial infarction and stent thrombosis in non-valvular atrial fibrillation (NVAF) patients presenting with acute coronary syndrome (ACS) or undergoing percutaneous coronary intervention (PCI). Methods and results A systematic review and meta-analysis were performed using PubMed to search for randomized clinical trials comparing DAT with triple antithrombotic therapy (TAT) in this setting. Three trials involving 8845 patients were included (4802 and 4043 patients treated with DAT and TAT, respectively). There were no significant differences in all-cause death and stroke between the aspirin-omitted DAT group and TAT group. Otherwise, the incidence of myocardial infarction was significantly higher with aspirin-omitted DAT vs. TAT [odds ratio (OR): 1.29, 95% confidence interval (CI): 1.02–1.63; P = 0.04; I2 = 0%]. Similarly, the incidence of stent thrombosis increased in patients treated with aspirin-omitted DAT vs. TAT (OR: 1.61, 95% CI: 1.02–2.53; P = 0.04; I2 = 0%). The occurrence of major bleeding and clinically relevant non-major bleeding events, as defined by the International Society on Thrombosis and Haemostasis, was significantly lower with aspirin-omitted DAT vs. TAT (OR: 0.61, 95% CI: 0.48–0.78; P = 0.02; I2 = 76%). Similar results were found according to the International Society on Thrombosis and Haemostasis major bleeding, Thrombolysis in Myocardial Infarction major or minor bleeding, and Thrombolysis in Myocardial Infarction major bleeding scales. Conclusion Aspirin-omitted DAT reduces the occurrence of bleeding episodes, with a higher rate of myocardial infarction and stent thrombosis in NVAF patients presenting with ACS or undergoing PCI.

european heart journal. cardiovascular pharmacotherapy

Aspirin-omitted dual antithrombotic therapy in non-valvular atrial fibrillation patients presenting with acute coronary syndrome or undergoing percutaneous coronary intervention: results of a meta-analysis