I just had my first A-fib attack last week scariest thing I have ever been through! I'm a pretty heathy guy 29 years old always active and this happens? stayed in the hospital over night none of the meds really worked to restore my regular heart beat until I finally fell asleep for two hours woke up and it was back to normal:) but they did an echocardiogram and the results were : Right and Left Atria are enlarged? they sent me home I had a follow up with a cardiologist a week later all she really told me was to come back in 6 months and hopefully it will have repaired itself , so is this something I should be worried about? I cant get it off of my mind Im still wondering if this caused the attack or they are enlarged from the attack ? if anyone has ever had this happen or knows something about it It would be soooo helpful!