One of our members, growler
, will probably be your best source of advice since she has a kitty with CRF, who was also hyperT at one point. I'll pm her a link to this thread, but in the meantime, some questions for you:
What does Bandit normally eat?
Do you know what her urine specific gravity is? What about some of her other lab values, like blood phosphorus and calcium levels?
Is she on any medication for the kidney issues now?
I agree with your decision not to give such a whopping amount of subQs all in one go. Even if you can just do 50ml once or twice a day, that would be way preferable to the 200ml in one session. I'm kind of surprised your vet recommended that for a cat with hbp. As for the heart issues, it's entirely likely that it's related to the hyperthyroid. Is it possible to start her on a lower dose of methimazole? It's frequently the case that vets start cats on too high of a dose. If you haven't checked out the Feline HyperT
Yahoo group, I recommend doing so. And there's lots of good info at this site as well: http://www.felineoutreach.org/Educat...hyroidism.html