Oops on the roller coaster thing. I should have put in the caveat, "after you're properly healed." Normal healing time for the sternum is 8-12 weeks. It might be less for you, but five would be pushing it. You can ask the doctor, but prepare to end up like the Titanic on this one.
However,
after healing, unless there are other issues with your heart that the replacement of the valves won't fix, or you have a connective tissue disorder (which the surgeon would discover), your heart shouldn't go into arrhythmias from it, nor will the stitches in your valve loosen or come out. The plumbing is good after the fix. The only concern I would see in the future would be intracranial (brain) bleeds. However, if people were getting those from the rides, the insurance companies would shut them down, even if the states, counties, and townships didn't.
I also have to agree with Patrick Haley, inthat a double replacement with tissue valves is less common, but hardly something that isn't done. There can be many good reasons to replace both valves with tissue, particuarly reasons that have to do with other conditions the person may have that would make anticoagulants a hardship.
For Nate, the use of tissue valves would almost surely lead to too many reoperations over his lifetime. That's not true for everyone. The surgeon who said "they" don't do that was simply stating the policy he and his group may have, certainly not that of thoracic surgeons everywhere (Mr. Haley being part of the proof of that pudding).
Best wishes,
