My mom experienced atrial fibrillation for the first time one month ago. Within 4 hours the rate came down and in 12 hours the beat converted back to normal. All of the heart tests were normal, stress test, echocardiogram , kidney function all normal...she was put on a blood thinner called xarelto and a rhythm medication 2 times daily called multaq. she has been in a normal sinus heart rhythm since she converted back one month ago. If this fibrillation was a one time event , she would like to stop these 2 medicines , what is a good amount of time to judge whether this is a one time problem?