I've been treated by Dr Cheng for over 10 years now and I feel very fortunate to have him as my doctor.  He's taken care of both atrial flutter and atrial fibrillation for me.  We tried meds when I was first had issues.  He was doubtful that would help but said the meds work with a small percentage of patients.  When that had little effect I had a cardioversion.  This worked perfectly for several years before new symptoms popped up.  A heart ablation took care of that and I have been fine ever since.  He warned me that another ablation may be needed some day, but so far so good.  He's a world-renowned expert in the field of arrhythmia and teaches at Baylor College of Medicine. He also leads a research team at the Texas Heart Institute.  I highly recommend Dr. Cheng.