Emma, glad it's over for him and those polyps are gone! It sounds like it was a good thing he forgot to take his BP med!
NST, the drug they use for conscious sedation is called Versed. I've had it once...and just had no memory of the procedure. I'm guessing that general anesthesia is okay for those with liver disease, at least for those who haven't decompensated, as I've had 8 major surgeries since being diagnosed with hep C.
Hugs,
Connie