Hello, Thanks for the query to H.C.M. Forum. Since you are so intelligent patient so need not to say any thing,but I want to explain in brief about atrial fibrillation so that you will get the answer your question. As your question is whether Atrial fibrillation will worsen if you took pravastatin already? An arrhythmia defined by the absence of coordinated atrial systole, which results from multiple reentrant electrical wavelengths that moves randomly around the atria. The definition is somewhat difficult but you understand that already used parvastatin will not worsen the A fibrillation at all. Prohibited aspirin so that risk of bleeding minimums & for ulcer. As your cholesterol level is normal so no need of any lipid lowering agents. Hope I have answered your question . Good for health. Dr. HET