You ask alot of good questions about fibrillation
To start, the medications you mention do not really trat atrial fibrillation
. They more or less control the symptoms and the morbidity associated with it..namely rapid heart rate and the risk of stroke. They mechanisms to treat atrial fibrillation incluse other antiarrythmics such as sotolol, amiodarone and procedures such as ablation and surgical correction.
Most importantly, in most patients, especially the elderly...