Comparing quality parameters of apheresis and pooled platelet concentrates

Introduction. Harvesting of pooled platelet concentrates (PC) significantly expands the volume of transfusion support and could be used to create strategic platelet reserve.

The aim of work. To compare the quality of pooled and apheresis platelet concentrates.

Materials and methods. We studied platelet fractions (PF), isolated from the whole blood of cadre donors with Reveos system, platelet concentrates, obtained by pooling PF (Pooled PC), and platelet concentrates harvested by automatic apheresis. In all cases 2 days passed from the moment of blood donation to the platelet examination. In PC samples we studied cellular composition, morphofunctional parameters of platelets, pH and electrochemical parameters, hypotonic shock response.

Results. The morphofunctional platelet rate in PF was significantly reduced, comparing to the normal levels. At the same time, the morphofunctional parameters of platelets did not significantly differ in PF and pooled PC. The pH values, the total content of platelets and leukocytes in the pooled PC corresponded to the requirements of The rules for procurement, storage, transportation and clinical use of donated blood and its components (2019). The total platelet count, the level of annexin-positive platelets, did not significantly differ in apheresis PC and pooled PC, hypotonic shock response was correct in apheresis PC and pooled PC. On the other hand, the level of platelets with granules in pooled PC was 1,8 times lower than in apheresis PC, other morphofunctional parameters of platelets in pooled PC were also reduced. Pooled PC were characterized by more positive level of open circuit potential and lower antioxidant capacity compared with apheresis PC on the same storage time.

Conclusions. Platelet pooling with Reveos system is acceptable for obtaining PC doses that comply with Technical Regulations. Nevertheless, methods of pooled PC harvesting need further optimization.

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