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Therapeutic apheresis: use of human serum albumin, fresh frozen plasma and cryosupernatant plasma in therapeutic plasma exchange

https://doi.org/10.1016/j.beha.2005.01.004Get rights and content

In therapeutic plasma exchange, patient plasma is removed and a colloid replacement solution is infused in its stead. A solution of 4–5% human serum albumin in saline is the recommended replacement solution in most instances, even though it leads to transient mild deficiencies of most plasma proteins. Albumin solutions are pasteurized to inactivate viruses, carry a very low risk of febrile and allergic reactions, and are convenient to store and administer. Fresh frozen plasma, which must be type specific and needs to be ordered in advance and thawed before use, carries a higher risk of reactions; however, it replaces all plasma constituents and is appropriate for patients with thrombotic thrombocytopenic purpura or a pre-existing coagulopathy. Neither cryosupernatant plasma, which is relatively depleted of the proteins in cryoprecipitate, nor pooled plasma that has been virally inactivated with organic solvents and detergents has been shown to be superior to fresh frozen plasma for any indication.

Section snippets

Human serum albumin

Between 70 and 80% of the oncotic activity in normal plasma is attributable to its albumin content, which averages 4.2 gm/dL.2 In the United States, a 5% solution of purified human serum albumin in normal saline is widely available in 250 and 500 mL bottles containing, respectively, 12.5 and 25 g of human serum albumin. A 4% solution is available and preferred in some other countries.3, 4

Fresh frozen plasma

The product name ‘fresh frozen plasma’ refers to a single donor plasma product that is frozen within 8 hours after collection and stored at −18 °C or below. It contains all known coagulation factors in therapeutically useful quantities. Plasma that is frozen between 8 and 24 hours after collection, sometimes called ‘24-hour plasma’, contains comparable levels of all coagulation factors except factor VIII; its factor VIII content is adequate for normal coagulation.29, 30

Replacement of patient

Cryosupernatant plasma

The material that remains after cryoprecipitate has been removed from fresh frozen plasma is a defined plasma product (plasma cryoprecipitate reduced) that is often called cryosupernatant plasma.37 It can be obtained from most blood suppliers. Cryosupernatant plasma is depleted of the constituents of cryoprecipitate, most notably the largest ‘normal’ vWF multimers. Prior to the discovery of the vWF-cleaving enzyme deficiency in thrombotic thrombocytopenic purpura, it was hypothesized that

Solvent/detergent plasma

Solvent/detergent plasma is pooled human plasma that has been treated with organic solvents and detergents to inactivate lipid-coated viruses, and then frozen in 200 mL aliquots.40 Compared to fresh frozen plasma, solvent/detergent plasma is relatively deficient in certain inhibitory molecules–proteins C and S in the coagulation cascade, α2-antiplasmin and α1-antitrypsin. It contains the vWF cleaving protease but, like cryosupernatant plasma, is depleted of the largest ‘normal’ vWF multimers.

Summary

A 4–5% solution of human serum albumin in normal saline is the most commonly chosen replacement fluid for plasma exchange. This isotonic, iso-oncotic product offers unmatched viral safety and ease of administration combined with a very low risk of either febrile or allergic reactions. Fresh frozen plasma is an appropriate choice in thrombotic thrombocytopenic purpura and in other instances in which replenishing normal plasma proteins such as coagulation factors is deemed important. Neither

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