Optimizing Whole Blood Storage: Hemostatic Function of 35-Day Stored Product in CPD, CP2D, and CPDA-1 Anticoagulants
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ORIGINAL RESEARCH Optimizing whole blood storage: hemostatic function of 35-day stored product in CPD, CP2D, and CPDA-1 anticoagulants Michael Adam Meledeo, PhD , Grantham C. Peltier, MS, Colby S. McIntosh, BS, James A. Bynum, PhD, and Andrew P. Cap, MD, PhD he use of whole blood (WB) for treatment and pre- BACKGROUND: Transitioning from whole blood (WB) to vention of hemorrhagic shock has its roots in the components developed from efforts to maximize donor battlefields of World War I,1 when citrated WB fi yield. Components are advantageous for speci c transfusions proved to be an effective strategy for derangements, but treating hemorrhage with components T 2,3 treatment of the most severely injured combat casualties. requires significantly more volume to provide similar WB use by the military in the early 20th century established effects to WB. Because storage lesion and waste remain the beginnings of the “walking blood bank” concept through problematic, this study examined hemostatic function of refrigerated WB stored for 35 days in anticoagulants widespread usage of fresh whole blood (FWB) collected dur- citrate–phosphate-dextrose-adenosine (CPDA-1), citrate– ing combat. WB use by the military has continued throughout 4 phosphate-dextrose (CPD), or citrate–phosphate-double every major conflict since World War I, but since Vietnam 5 dextrose (CP2D). the use of WB has declined in favor of component therapy. METHODS: Refrigerated WB units from healthy donors The impetus for transitioning to blood component ther- were sampled over 35 days. Global hemostatic apy developed from efforts to maximize the therapeutic yield parameters were measured by thromboelastometry, thrombogram, platelet aggregometry, and platelet adhesion to collagen under shear conditions. The effects ABBREVIATIONS: ASPI = assay for determination of platelet of transfusion filtration and mixing 35-day stored product function triggered by arachidonic acid; CP2D = citrate–phosphate- with fresh WB were evaluated. double dextrose; CPD = citrate–phosphate-dextrose; CPDA-1 = RESULTS: Countable platelets declined as aggregation citrate–phosphate-dextrose-adenosine; CT = clotting time; EXTEM = clusters appeared in microscopy. While gross platelet tissue factor pathway activation thromboelastometry; FFP = fresh agonist-induced aggregation declined over time, frozen plasma; FIBTEM = functional fibrinogen normalization revealed aggregation responses in thromboelastometry; FWB = fresh whole blood; INTEM = contact remaining platelets. Peak thrombin generation increased pathway activation thromboelastometry; MCF = maximum clot over time. Clot strength diminished over storage in tissue firmness; PPP = platelet-poor plasma; PRP = platelet-rich plasma; factor–activated samples (normalized by filtration of ROTEM = rotational thromboelastometry; TRAP = thrombin aggregates). Functional fibrinogen responses remained receptor-activating peptide; WB = whole blood. consistent throughout. Filtration was necessary to maintain consistent platelet adhesion to collagen beyond From the United States Army Institute of Surgical Research, JBSA- collection day. Few differences were observed between Fort Sam Houston, Texas. anticoagulants, and stored/fresh mixing studies Address reprint requests to: Michael Adam Meledeo, PhD, normalized coagulation parameters. United States Army Institute of Surgical Research, 3650 Chambers CONCLUSIONS: WB is easier to collect, store, and Pass, Bldg 3610, JBSA Fort Sam Houston, TX 78234; e-mail: transfuse. WB provides platelets, an oft-neglected, [email protected] critical resuscitation component, but their individual The opinions or assertions contained herein are the private numbers decline as aggregates appear, resulting in views of the authors and not to be construed as official or as reflect- diminished coagulation response. WB has better ing the views of the Department of the Army or the Department of performance in these assays when examined at earlier Defense. time points, but expirations designated to specific Received for publication October 1, 2018; revision received anticoagulants appear arbitrary for hemostatic November 20, 2018, and accepted November 20, 2018. functionality, as little changes beyond 21 days doi:10.1111/trf.15164 regardless of anticoagulant. © 2019 AABB TRANSFUSION 2019;59;1549–1559 Volume 59, April 2019 TRANSFUSION 1549 MELEDEO ET AL. of each blood donor. By separating WB to components, mul- (2–4 C). By 1978, CPD supplemented with adenine (CPDA- tiple patients could benefit; for example, red blood cell (RBC) 1) was in use, increasing the available storage time of WB concentrates could be given for anemia or platelets for and RBCs to 35 days. Extensions in shelf life were attributed thrombocytopenia. These individual components can be to adenine’s contribution to the increased synthesis of aden- stored under different conditions to improve their quality. osine triphosphate.21 Citrate–phosphate-double dextrose Despite a lack of comprehensive clinical trial data comparing (CP2D) has been less commonly used as an anticoagulant for outcomes to WB transfusion, component therapy became the blood and blood products since the 1970s, with the higher most widely used method for all transfusion services, includ- concentration of dextrose and thus higher osmolarity than ing patients with traumatic hemorrhage in both civilian and CPD intended to support RBCs.22 However, CP2D- military settings, as it remains to this day. Strategies have anticoagulated WB has the same 21-day shelf life as CPD. been developed to adapt component transfusion therapy to While CPD is still the primary choice for WB, the the needs of bleeding patients using RBCs, fresh frozen 35-day shelf life of CPDA-1 is appealing for logistical rea- plasma (FFP), and platelets given in a 1:1:1 ratio6 as an alter- sons and waste reduction—albeit with a greater likelihood native to the often unavailable WB product. It has been noted of diminished hemostatic capacity due to developing stor- that this ratio is often difficult to achieve outside of trauma age lesion at later time points. This work examines the centers—platelets, with their short shelf life of 5 days, are fre- hemostatic performance of WB stored at 4 C over 35 days quently unavailable or saved for the most serious cases. in vitro, with a comparison of WB units anticoagulated with However, studies have shown that in some cases treating CPD, CP2D, and CPDA-1. traumatic hemorrhage with blood components leads to a resuscitation milieu requiring a larger volume to achieve the same hemostatic effect when compared to WB.7,8 Recent METHODS studies indicate that this is largely due to the poor aggrega- Collection of FWB tion response of stored, aged platelets, although revised stor- FWB was collected from healthy donors according to an age modalities have been explored to improve platelets’ approved institutional standard operating procedure in functionality (as measured by aggregation and clot forma- * – 450-mL CPD bags (BB AGT456A2, Terumo BCT; n = 7, all tion) over longer durations.9 12 However, all blood compo- male), 450-mL CP2D bags (121–63, Haemonetics; n = 4, all nents suffer from a “storage lesion,” resulting in an overall male), or 500-mL CPDA-1 bags (4R3327E, Fenwal; n = 10, reduced resuscitation capacity and a need to transfuse more 9 male), all with the same expected ratio of anticoagulant to product to achieve desired effects as products age.13 blood (1:7). Units were stored without agitation in a walk-in Platelets play a critical role in maintaining hemostasis refrigerator set to 4 C with constant monitoring. An addi- and have convincingly been shown to contribute to better tional sample of blood was collected in blood collection outcomes and lower mortality when used with other trans- – tubes (K2-EDTA vacutainers, Becton Dickinson) from each fused blood products.14 16 While current US Food and Drug donor for baseline measurements of complete blood Administration blood banking guidelines promote platelet count (CBC). storage at room temperature (resulting in a platelet product with a severely reduced aggregometry response within a few Sample preparation days due to the platelet storage lesion), our group has shown that refrigeration of platelets at 4 C results in preser- On each sampling day (0, 3, 7, 14, 21, 28, and 35), bags were vation of metabolic activity and procoagulant function as gently mixed by hand, and approximately 15 mL of blood observed through improvements in aggregation response, was slowly removed in a sterile environment by Luer lock × clot strength, and adhesion under flow conditions.11,17,18 syringe. Of this, 2 mL was centrifuged at 200 g for Storage of platelets within their WB environment at 4 C 10 minutes to create a platelet-rich plasma (PRP) layer sep- × could combine a more functional platelet product with eas- arated from RBCs, and 2 mL was centrifuged at 2000 g for ier administration, enhanced availability, and increased 20 minutes (twice) to obtain a platelet-poor plasma (PPP). storage capacity, improving the ability to provide hemostatic WB CBC was measured at each time point in an auto- resuscitation in the prehospital setting, during early in- mated hematology analyzer (ABX Micros 60, Horiba). hospital resuscitation, and in austere combat environments. Essential blood chemistry was measured by a blood ana- While component therapy has been the more favored lyzer (i-STAT, CG4+ cartridge; Abbott Laboratories). approach, recent conflicts have renewed interest in WB use on the battlefield.19,20