Luck of the draw to a large degree, I think!
I went into A-Fib very shortly after they wheeled me from the OR into CICU. I certainly don't remember it. They controlled it with some Amiodarone (or however you spell it) for a day, maybe just a few hours. Never had A-Fib again (knock on wood).
As for those benign arythmmias, well, they come and go for me. The first 4 months post op the were pounding hard and annoying, so beta blockers were prescribed and did the trick. I always say that my heart was doing a "happy dance"!! Eventually I weaned myself (with permission from docs) off the beta blockers. Now I have episodes from time to time, but not too serious.
Look. Things may change for you. You can't control this, like as you may. All the best of everything may not be enough to keep you from having to live with some changes. You have to let go a little, here. In the letting go, I think we honestly allow a more positive result.
Regardless of what occurs in your personal journey; the best thing will be waking up and knowing that you get to continue the journey. This fact will become ever more meaningful to you the more post surgery you get.
Keep on fact gathering though!! Your questions help everyone!
AVR 4/18/06, age 52. Bovine tissue. CE Perimount RSR Model 2800. 23 mm. BAV diagnosed age 27(1981). Moderate stenosis (1.0 cm) 9/03; severe stenosis (.7cm) 12/05, Aortic measure at surgery 4/06, critical (.53 cm)