Subjects randomized to treatment with dextran 70 will receive it as a daily intravenous dose for the three days of the treatment protocol. A total daily dose of 1.0 g/kg will be administered. Because the hemodynamic compromise is often delayed by up to 48 hours after the diagnosis of SBP, daily dosing of dextran-70, instead of a single dose regimen, is a better pharmacokinetic treatment strategy in addressing the gradually worsening hemodynamic status involved with the progression of SBP to HRS. In normal humans, 45-60% of the infused dose of dextran-70 is recovered in the urine within 48 hours and the elimination half-life is approximately 24 hours. As stated above, in order to preserve blinding, the albumin, placebo, and dextran 70 treatment will all be equivolume and visually indistinguishable. An intravenous multivitamin additive will be used in the dextran solution in order to assure that the 6% dextran and 25% albumin solutions are of the same color. This multivitamin diluent has been used successfully for the same purpose in other blinded studies at UVAHS with no adverse events or known benefits associated from the multivitamin component.