Oh Lisa, no one is arguing here. The question Sully posed is why would they keep someone overnight for a graft surgery and not the fistula. I answered that possibly because of the foreign object vs the natural veins. You may not have had to be in over night when they put your PD catheter in, but My husband was kept over night when he had his. I never questioned it, in fact, I felt savier them keeping him overnight. I do however feel, looking back, that they were concerned about infections with him. He is susiptable to infections. He has lost some limbs due to infections, so I don't think it was by accident, they kept him overnight! And I did not say that it was the law and mandatory either, I was trying to explain the whys to Sullys question, with out reference or data or proof.Im not here to argue dear, with anyone., Im just trying to shed light! Sorry if I came across like that. God Bless, lmunchkin