Atrial Fibrillation is one of the most common dysrhythmias faced by the emergency physician. Anchoring on A-Fib as the final answer however maybe a mistake. The session will talk about identifying complex A-Fib with keys to recognize it. It will also describe the possible effects of being too aggressive in treating atrial fibrillations. It will also highlight where in the guidelines we must pause to identify the medical causes of A-Fib.