Medical Treatment of Portosystemic Shunts
Here is the anesthetic recommendation.
Masking down and maintaining with Isoflurane is a good way to go.
That is what Ellie's vet does.
No NSAIDs should be given if liver function is in question.
Ellie most likely doesn't have LS but may have MVD.
She also had a vaccine reaction.
She has some other health issues also, so it is hard to say how her liver is doing but it seems to be fine. Yes, she did have oral surgery before we knew that she had a liver functioning problem and she did fine. Then she was spayed, had a liver biopsy and a dental in the same day and did fine.
Did you test bile acids?