Regional blood flow alterations after bovine fumaryl beta beta-crosslinked hemoglobin transfusion and nitric oxide synthase inhibition

Critical Care Medicine
J A UlatowskiR C Koehler

Abstract

a) To determine whether isovolemic exchange transfusion with cell-free, bovine fumaryl beta beta-crosslinked hemoglobin results in a different pattern of regional blood flow distribution than transfusion with a poor oxygen-carrying, colloidal solution. b) Because of potential nitric oxide scavenging by plasma-based hemoglobin, to determine whether blood flow differences are reduced after nitric oxide synthase inhibition. A prospective, randomized design with repeated blood flow measurements within groups. Experimental physiology laboratory in a university medical center. Pentobarbital-anesthetized female cats. Three groups of eight cats were studied: a) a control group with no transfusion (hematocrit of 32%); b) an anemia group in which exchange transfusion with an albumin-containing solution reduced hematocrit to 18% over a 40- to 50-min period; and c) a group in which cell-free hemoglobin was exchanged transfused to reduce hematocrit to 18%, without a proportional reduction in oxygen-carrying capacity. Bovine hemoglobin was covalently crosslinked intramolecularly between the 81-lysine residues on the beta-subunits to stabilize the tetramer. Regional blood flow was measured by the radiolabeled microsphere technique before tran...Continue Reading

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