I'm so glad that Beau is with you now and enjoying a wonderfully comfortable life; I hate to think of him wandering alone when he's feeling so rotten. He looks like a handsome and cuddlesome cat, one who likes to tuck himself against you when you lie down.

Sometimes liver values can be high due to an infection, at least that's what happened to one of my elderly cats. After antibiotic treatment, they went back to normal. I don't really want to say this, but hyperthyroidism and renal failure can be a difficult combination to treat. I went through this last year with my very special Artful Dodger (who also had heart problems). Hyperthyroidism actually forces more blood through the kidneys and so makes them work more efficiently and keeps the values closer to normal. When you treat the hyperthyroidism, you can increase the renal failure. However, since Beau still has "within normal range" kidney function values, the hyperthyroidism treatment may make them go up only a little - and extra sub-q fluids should help there. Hoping for the best for you both.