http://bulletin.piwet.pulawy.pl/archive/50-4/26_Lew.pdf

This is a report on a study done with 3 cats in advanced stages of renal impairment, and how peritoneal dialysis worked for them. It worked well...except in the case of one patient came back three months afterwards in such bad shape and with a bleak prognosis that the owners requested euthanasia.

However - this study was done in 2006. Based on the teensy bit of research I did here...it seems that if a cat has any renal function at all, that the peritoneal dialysis gives the kidneys a break and allows them to catch up.

hugs...this might or might not be worth it...