Well if it is a liver shunt I would definitely joing this yahoo liver shunt group. My Teddi had a liver shunt and had surgery at University of Tennessee and is now all better. She only weighed 2 lbs. 10 oz. when she had surgery. Here is the yahoo group...they can answer all your questions about LS's.
Liver_Shunt_And_MVD_Support : Liver Shunt & MVD/HMD Support