Goal 2: Reduce Human Disease

What new methods of platelet preparation, processing, and storage are needed for hemostasis in various clinical conditions?

The limitations of 5-day 22˚ C storage significantly impacts platelet availability. It is critical that we develop new methods of collection, processing, storage to extend the storage time of platelets, and evaluate the use of whole blood. The attributes of these products must be understood to optimally alignment product attributes, clinical efficacy and safety with hemostatic needs in a variety of clinical states. Specifically, what measurable characteristics of these products and their effects in the recipient can be used to maximize safety and efficacy? In what clinical situations are different platelet components most effective? What laboratory tests, including point of care, could guide platelet transfusion therapy?

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Is this idea a Compelling Question (CQ) or Critical Challenge (CC)? : Compelling Question (CQ)

Details on the impact of addressing this CQ or CC :

Limitations of current storage methods challenge our ability to meet the increasing demands of cancer chemotherapy and complex surgeries as well as provide platelets to remote areas where trauma frequently occurs. Platelets are transfused to prevent or control bleeding without robust translational or clinical trial evidence of efficacy and safety. In patients with hypoproliferative thrombocytopenia receiving chronic platelet transfusion predominantly for prophylaxis, post-transfusion increments, survival time, and durable hemostatic efficacy are important; however, platelet transfusion alone does not prevent bleeding. The overall state of hemostasis, the endothelium and donor characteristics that affect platelet quality may be important considerations in selecting the best platelet product tailored to individual patients. Better laboratory and clinical measures of platelet function, efficacy and safety are essential for best use of these limited resources. These outcomes should span and link in-vitro testing, animal models, and clinical effects such as thrombotic events, immune, hemostatic, and endothelial effects. Extrinsic, recipient factors (e.g., immune deficiency, platelet or endothelial dysfunction) and intrinsic factors (e.g., donor specific or platelet preparation) should be considered. Systematic analysis of recipients and donors should be broad and include considerations of glycomics, metabolomics, proteomics, genomics, in vivo microscopy, and advanced imaging.

Feasibility and challenges of addressing this CQ or CC :

Radiolabeled platelet recovery and survival methods are well established and feasible to perform at several centers within the US. Currently 4-6 million units of platelets and whole blood are transfused per year. It is very feasible to conduct clinical trials that compare methods of platelet preparation, processing, and storage in children and adults who require platelets for either prophylaxis or active bleeding. Multiple research networks that focus on both pediatric and adult transfusion medicine are motivated to perform the pre-clinical and clinical trials required to establish improved efficacy and safety of platelet-containing blood products.

Name of idea submitter and other team members who worked on this idea : Terry Gernsheimer, University of Washington, for the 2015 NHLBI State of the Science in Transfusion Medicine

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Idea No. 434