@vaughandodd Whew, that's quite bit of bother there. But, it sounds like you have an informed and concerned team pulling for you.

I know that flutter is often the result of an ablation for AF, but I haven't looked to see if it also works the other way around. [Just did, and it does.] That kind of flutter is usually relatively easy to ablate.
https://www.aerjournal.com/articles/atrial-flutter-typical-and-atypical-review
I wish you the very best of luck in the treatment of both your flutter/AF, whatever it turns out to be when they ablate (if they ablate) and the repair of your aorta. I would love it if you would return and give us all an update in time. 🙂