Advances in erythrocyte preservation and hemoglobin substitutes.

The desirability of extending the therapeutic benefits of erythrocyte transfusions beyond the currently available options is well established. Extended frozen storage of rare blood types, hemoglobin-based or artificial blood substitutes for treatment of short-term deficits in oxygen-carrying capacity, novel approaches to tissue oxygenation for cancer therapy, and efficient storage and availability of erythrocytes in military field installations are all potential applications of ongoing research and development efforts. This review explains the need for improvement in erythrocyte storage and development of blood substitutes, the current problems in the field, and the progress made toward solving these problems in the past year.