Have been taking 150mg propafenone hydrocloride twice a day for 18 months to control Atrial Fibrillation with good results however last three days AF has returned and the medication has not helped...I have had shoulder surgery 17days ago still in considerable pain could this be triggering it off despite my taking my pills...3 days ago took extra strength panadine (codeine and paracetamol) 8 tabs/24hrs..could this have interfered with my AF medication...my doctor is away this weekadvise will be greatly appreciated. Thank You, Buddy Lorenand

Summarized question: Could pain from a shoulder surgery be triggering the Atrial Fibrillation ?