My 72 year old brother has been taking Coreg for Atrial Fibrillation and it (plus an oblation procedure) kept him in Sinus rhythm for 3 years. He has recently begun experiencing episodes of falling out of Sinus rhythm and his doctor prescribed Valsartan (Generic for Diovan) two days ago. I am reading that Valsartan is normally used for treatment of high blood pressure and/or heart failure. Is it also commonly used to help control irregular heart beat?