Plasma transfusion for bedside, radiologically guided, and operating room invasive procedures_ 3691 20..29
Michael Desborough and Simon StanworthFrozen plasma (FP) is commonly used in an attempt to correct coagulation defects before performing bedside, radiologically guided, or operating room procedures. A recurring theme for transfusion of plasma is variation in practice and uncertainty around the evidence-based indications informing appropriate use. Plasma for transfusion is given primarily for two indications: to prevent bleeding (prophylaxis) or to stop bleeding (therapeutic) (Fig. 1). This article will present a review of the prophylactic use of plasma, in the context of bedside or radiologically guided invasive procedures or for surgeries in the operating room. The role of plasma in the management of bleeding is the topic for a different article in this supplement.
DEFINITION OF FPFrozen plasma (FP) is human plasma that has been obtained either from a single, whole blood donation or from plasmapheresis. It contains a heterogenous group of proteins, including procoagulant and inhibitory components of the coagulation system, acute-phase proteins, immunoglobulins, and albumin. For the purposes of this review, fresh-frozen plasma (FFP; frozen within a short specified time period after collection before storage) and plasma frozen at later intervals (typically up to 24 hr) after collection (FP or FP24), will be covered by the common term FP. Before transfusion, it is thawed to room temperature. FP can be stored at 1 to 6°C for up to 5 days without evidence of a marked decrease in clotting factors. The only plasma protein, which is quality controlled in the United Kingdom and European Union, is Factor (F)VIII.1 Monitoring FVIII levels is not a requirement under the AABB standards in the United States.To reduce the risk of transfusion-transmitted infections, pathogen inactivation technologies have been applied to plasma. These include treatment with methylene blue (a phenothiazide dye) and light, solvent and detergent (S/D plasma), and amotosalen treatment, when psoralens are added to plasma, which is then exposed to UVA light. But these techniques cause more coagulation factors and other plasma proteins to be lost during the manufacturing process, 2,3 although the clinical consequences of these changes are not fully appreciated.