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What happened to blood substitutes?
1Blood Transfusion Service, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114-2696, USA. cstowell@partners.org
Summary
Research into hemoglobin-based oxygen carriers, or HBOCs, has advanced understanding of oxygen delivery. Key properties like diffusion, viscosity, and oncotic pressure are crucial for HBOC efficacy.
Area of Science:
- Biomedical Engineering
- Hematology
- Pharmacology
Background:
- Concerns regarding blood supply safety and adequacy have driven research into blood substitutes for two decades.
- Hemoglobin-based oxygen carriers (HBOCs) are a prominent class of blood substitutes under investigation.
- Despite extensive research and clinical trials, no HBOCs are currently licensed in North America or Europe.
Purpose of the Study:
- To investigate the safety and efficacy of hemoglobin-based oxygen carriers.
- To understand the physiological regulation of oxygen delivery.
- To elucidate the mechanisms underlying the vasoactivity of HBOCs.
Main Methods:
- Review of research and clinical trial data on HBOCs.
- Analysis of colligative properties of hemoglobin solutions.
- Examination of oxygen diffusion, viscosity, and colloid oncotic pressure in relation to HBOC function.
Main Results:
- Research has significantly improved the understanding of oxygen delivery and its regulation.
- Vasoactivity in some HBOCs has been linked to specific solution properties.
- Key colligative properties, including oxygen diffusion coefficient, viscosity, and colloid oncotic pressure, are critical determinants of HBOC efficacy.
Conclusions:
- Hemoglobin-based oxygen carriers show promise but require further development for clinical application.
- Understanding the physical chemistry of HBOCs is essential for optimizing their therapeutic potential.
- Colligative properties play a vital role in the performance and safety of hemoglobin-based oxygen carriers.