November 18, 2011 – Boston Scientific’s Watchman left atrial appendage (LAA) closure device has been implanted in the first patients in Latin America. The device is designed for use in patients in atrial fibrillation who are at risk for stroke and are eligible for long-term oral anticoagulation therapy such as warfarin. Watchman is intended to prevent embolization of thrombi that may form in the LAA, thereby preventing the occurrence of ischemic stroke and systemic thromboembolism in patients with non-valvular atrial fibrillation. The first patient implants were performed by Bernardo Caicedo, M.D., interventional cardiologist, at Angiografia de Occidente in Cali, Colombia.