MARLBOROUGH, Mass., Oct. 29, 2020 /PRNewswire/ -- Boston Scientific Corporation (NYSE: BSX) has initiated the CHAMPION-AF clinical trial to evaluate the safety and efficacy of the WATCHMAN FLX™ Left Atrial Appendage Closure (LAAC) Device within a broad population of patients with non-valvular atrial fibrillation (NVAF), including those who are at low-to-moderate risk of bleeding from the use of anticoagulation. The device will be compared to treatment with non-vitamin K antagonist oral anticoagulants (NOACs), considered the leading contemporary drugs for stroke risk reduction in this population.