In a study called the AFFIRM trial, medications to slow the heart rate, such as beta-blockers, calcium channel blockers, and
digoxin, were found to be preferable to antiarrhythmic medications as a first-line treatment for certain people with atrial fibrillation, specifically older people at risk for stroke who did not have severe symptoms of atrial fibrillation."
I think it's up to the treating Cardiologist right now...