Liz Buchanan BVSc MRCVS
Keymaster
1) Most of the time, cats are put on iv fluids to rehydrate the animal and the speed at which that happens, usually reflects how quickly the fluid is administered. If there hypovolaemia / low blood volume / dehydration, circulation can actually be restored very quickly - within, say half an hour. However, when the fluids are stopped, if the kidneys are still not doing their job, then dehydration begins to recurr. I suspect that in the 'cleansing' you describe, the idea is to keep the patient on fluids until kidney perameters toxins etc are at a normal level, which I suppose would be different for every cat. However, if the kidneys remain leaky, the dehydration is likely to slowly recurr from the moment the drip is stopped; if I have understood this correctly (please ask your vet), then it is not widely practised in the UK, except perhaps to allow owners time to say goodbye during end-stage renal failure. The time taken to recurr would depend how 'leaky' the kidneys are. 2) the causes of kidney disease in cats are many and complex, from the acute (rapid eg drinking toxins) to the more common slow-onset kidney failure of cats. Some NSAIDS can certainly have an impact on the kidneys (although they can have a lovely impact on cats experience of chronic pain, for example, and one can be used to justify the other in low risk cases) but vaccines, to my knowledge, do not.
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