Patients with atrial fibrillation are exposed to a high risk of thrombus in the left atrium that can induce cerebral vascular events or systemic embolisms. This justifies the prescription of anticoagulant therapies in patients with high risk of thromboembolic event. Percutaneous left atrial appendage closure is a new interventional strategy for patients with high risk of cardiovascular events and a counter-indication for long term treatment with anticoagulant agents. However, only few data are available on effectiveness and prognosis of patients treated by this new interventional strategy.