Hi, My name is Lin, haven't been on Health Boards for a while. I started out with thyroid issues many years ago & had to have my thyroid & 1 parathyroid removed due to nodules. I started feeling really bad in 2011 & on 11/1/11 I changed DR's because I could not see my Dr it was always the nurse practitioner. The new Dr immediately found that I was in A-Fib. He sent me to his Cardio Dr & they admitted me in the hospital & did a Cardioversion. I stayed in rhythm for a week & then reverted back into A-Fib. Went back into hospital but could not get my heart to go back into sinus rhythm. I have been on several heart meds & also am seeing an Endocrinologist that is working along with my Cardio Dr to get things straightened. They feel that my thyroid meds were not being regulated properly & that threw me into A-Fib. I was Hyperthyroid then. On Oct 2 I had a Reveal Implant to monitor my A-Fib. Then in Dec. 2012 all of my blood work was wacked out & now I am hypothyroid. When I went to my Cardio on 1/17/13 my Dr said I had had 27 episodes since Dec 12, 2012. I was shocked. He said that I had gotten better & that put me at .7%. He said that is much better than 1%. Does anyone know how they come about these percentages & what is considered good & what is considered really bad? My thyroid dosage has been increased slightly so maybe that is helping. Has anyone been through any of this?