Hi @parkgp. Interested in your single experience with atrial fibrillation which, as you describe it, demands an additional focus of your medical treatment. The "blood thinners" that you question are better known as "anticoagulants" -- more to delay or prevent clots formulating than to thin the blood. For example, I've been diagnosed with a-fib regularly for several years, and I had a blood clot form in the atrium of my heart and lodge in a small artery in my brain. In response, my medical team prescribed Coumadin (active ingredient Warfarin). Two important points are required to manage my condition: First, irregular rhythm in my heart and, second, the degree of coagulation of my blood as shown by regular INR blood tests that show my prothrombin time (PT) -- how long it takes for a clot to form. For me, "how much a-fib" is not the issue. I want to know 1) if a-fib shows up on any EKG; 2) since it does, what is my prothrombin time and whether it is stable in every blood test, 3) whether my medical team's a-fib therapy keeps me safe from clots and/or serious rhythm problems in my heart. Finally, I don't believe my anticoagulant provides any significant treatment for a-fib; it only guards against the side effect of clotting. I hope my experience provides some points that you can discuss in detail with your medical team. Martin