Stroke Clinical Trial
Official title:
Short-Term Anticoagulation Versus Antiplatelet Therapy for Preventing Device Thrombosis Following Left Atrial Appendage Closure. The ANDES Trial
The objective of the study is to compare short-term (8 weeks) anticoagulation therapy (DOAC) vs. antiplatelet therapy for the prevention of device thrombosis following transcatheter LAAC.
Transcatheter left atrial appendage closure (LAAC) has emerged as an alternative to anticoagulation for preventing thromboembolic events in patients with atrial fibrillation. Whereas most complications associated with LAAC have decreased over time, the occurrence of device thrombosis remains a concern, with an incidence of 1 to 17%. Antithrombotic therapy for preventing device thrombosis following LAAC has evolved empirically, with antiplatelet therapy being the most commonly prescribed treatment. However, the rates of device thrombosis post-LAAC remain relatively high and have not decreased over time despite of increasing operator/center experience and the arrival of newer generation devices. This is of particular concern if we consider that LAAC is a preventive treatment. Experimental and mechanistic studies have suggested enhanced thrombin generation (and not platelet activation) within the days-weeks following the procedure as the most important mechanism involved in device thrombosis and appropriate short-term anticoagulation therapy with DOAC should translate into a significant reduction in the rate of device thrombosis post-LAAC. Therefore, the objective of the study is to compare short-term (60 days) anticoagulation therapy (DOAC) vs. antiplatelet therapy for the prevention of device thrombosis following transcatheter LAAC. It is estimated that 350 patients will take part in the study. Update: A blinded interim analysis was performed with the analysis of clinical and TEE (central echo core lab) data from the initial 155 patients included in the study. Based on the results of the interim analysis, and considering the total number of events and the high rate (20%) of patients with either early cessation of the allocated treatment (before the 60-day TEE examination) or missing TEE at 60 days, it was decided to increase the sample size by 160 patients up to a total of 510 patients. This would ensure to include at least 350 patients with a TEE examination performed while receiving the allocated antithrombotic treatment. ;
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