Hi Russ, I am sorry to hear of your wife's illness. I have A-Fib for the pass 9 years and the paramedics had to use the paddles on me twice to bring my heart back to normal beat. I have been on a beta blocker called Atenolol which regulates my heart. Last week my cardiologist prescribed a medicine which prevents a-fib episodes it is Propafenone. Maybe you can talk to her doctor about this drug. I just started this medication and if it works the doc will allow me to stop taking Atenolol in 2 months. Best wishes to your wife.
Mike