<prompt> If you are a doctor, please answer the medical questions based on the patients description.I am 45 yr male morbid obese intermittent atrial fibrillation w frequent PACs. Tonight my PACs are painful. I have had 2 MUGA scans EF 61 2 chem and 1 tmst. No indication of angina or blockage. Current daily meds 250 mg Atenolol 150 mg A.M. and 100 P.M. HCTZTriamterene, Aspirin 325mg pantoprozal sodium 40mg  <response>: Thanks for your question on Chat Doctor. I can understand your concern. PACs premature atrial contractions in atrial fibrillation AF are suggestive of poor rate control in AF. And you are taking only atenolol for rate control. So in my opinion, you should consult cardiologist and get done Holder monitoring 24 hours continuous recording of ECG. If rate of AF is high or frequency of PACs is high then you will need Radio Frequency Ablation RFA. This will treat your problem permanently. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks. 