krsitin,
thanks for the post.
1) Can an accelerated junctional rhythm persist or am I likely to revert back to the atrial fibrillation?
It can, but persist in some people. You can try different drugs to manage and convert it, as your physicians have done. Sometimes ablation of the junctional focus can be considered in persistant cases.
2) Can you help me to understand accelerated junctional rhythm?
The normal pacemaker cells of the heart are not working properly for unclear reasons. The cells in another portion of the heart have taken over this responsibility.
good luck