Why do urinary tract infections cause dementia symptoms to worsen?

I think it affects the blood which runs through the whole body. MIL goes really batty, and doesn't remember when she is in that state.
Blood infection, kidneys filter so it has to do a whole number on the filtering system. There not good. Makes the patient look crazy and act crazy.

Both urinary and respiratory infections affect brainwave activity to the point of producing delirium. Epileptics may experience increased seizure activity. The chemical balance of the brain is a very delicate thing.
Medicines are given in milligrams-- 1 mg is one thousandth of a gram. That's too small to pick up! It has to be mixed with a whole lot of inert powder just so you can find it.