4/23/11

What prevents water loss from the blood in kidney dialysis for urea?


What prevents water loss from the blood in kidney dialysis for urea?My physiology teacher is asking what should be the composition of dialysis fluid in order to remove urea, but not water. I know that once the urea leaves, the osmolarity of the blood will go down, so water will want to rush into the dialysis fluid. How is that prevented?

Posted by Quietscherin
A hypotonic fluid, a solution which has a lower than physiological osmolarity. I believe, you should double check this since I am not a dialysis nurse. Since the solution has less particles the particles in the blood will want to transfer into the hypotonic solution, eventually the water in the solution would want to move to the blood but this takes alot longer so it's not something that needs to be worried about. I believe this is what is often used in Peritoneal Dialysis

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