Rapid bedside rejuvenation of red blood cell with an autologous cell salvage device.

Abstract

During storage, red blood cells (RBCs) undergo physicochemical changes which affect the quality, function, and invivo survival of transfused packed RBCs (pRBC). Changes include decreased 2,3-diphosphoglycerate (2,3-DPG) levels, decreased ATP, changes in mechanical properties and oxidative injury. RBC rejuvenation is a method used to increase levels of 2,3-DPG and ATP in pRBCs. This process requires incubating the pRBCs with a rejuvenation solution and subsequent washing. Standard blood bank protocols using the COBE 2991 Cell Processor require several hours of preparation. The objective of this study was to verify if a bedside protocol for rejuvenating pRBC and washing with the Sorin Xtra autologous cell salvage system could be used. Outdated pRBC units were obtained and rejuvenated in a model operating suite using a dry air incubator for 1h at 37°C. Six units of pRBCs were pre-diluted with saline (1000ml) and six units were not pre-diluted with saline. All units were washed with normal saline (1000ml) using an apheresis-design cell salvage device in manual mode and wash volume set to 3000ml. Samples were collected and analyzed for standard RBC quality parameters at baseline and post-wash. Total pRBC wash efficiency was 94% ± 12% at a final hematocrit of 67.7±5.9% while maintaining post-wash hemolysis 0.24±0.12 %. Pre-dilution prior to washing did not confer statistically significant differences in final RBC quality parameters with the notable exceptions of calculated hemolysis and supernatant potassium levels (P<0.05). The washing process can be completed within 10min. The post-wash RBC parameters are appropriate for immediate transfusion to patients.