Abstract 189: Intraosseous Transfusion With Hemoglobin Vesicles for Severe Hemorrhagic Shock Rabbits

Abstract

Background: We developed a Hemoglobin vesicle (HbV) and which is an artificial substitute for Red blood cells (RBCs). Objective: To evaluate the efficacy of intraosseous HbV transfusion for alternative treatment instead of massive RBCs transfusion in rabbits with hemorrhagic shock. Methods: Hypohemoglobinemia (Hb 5.0 ± 0.7 g/dl) was induced in rabbits by blood withdrawal (70% of total blood volume) and half compensative infusion of normal saline (35% of total blood volume), which resulted severe hemorrhagic shock (mean arterial pressure 21 ± 2 mmHg). Immediately, shortage of the blood volume (35% of total blood volume) was intraosseously infused of lactate ringer (n=8), 5% human serum albumin (n=10) or HbV with 5% human serum albumin (3:2=vol: vol) (n=8). During the experiment hemodynamics and blood cell counts were measured with time. Results: Mean arterial pressure immediately recovered (44 ± 11 mmHg), improving hypohemoglobinemia (7.1 ± 0.6 g/dl) by administration with HbV, although rabbits receiving 5% Albumin and lactate ringer never improved hemodynamics and hypohemoglobinemia. (33 ± 7 mmHg / 3.4 ± 0.4 g/dl, 26 ± 4 mmHg / 4.5 ± 0.4 g/dl, p < 0.05 vs HbV group, respectively) As a result, 75% of rabbits receiving HbV survived after 24hours, while half of rabbits with 5% Albumin were dead within 18hours and all rabbits with lactate ringer were dead within 6hours. Conclusions: Intraosseous infusion of HbV effectively restore the Hb and maintain the hemodynamics for acute hemorrhagic shock in the difficult situation to get blood access.