Abstract
Methylene blue (MB) or solvent/detergent (SD) treatment is used for the inactivation of lipid-enveloped viruses in plasma. One important characteristic of the SD treatment is the necessity to pool plasma from different donors, thus inducing the risk of spreading infectious particles. MB treatment can be applied to single-donor plasma, causing no greater infectious risk than conventional fresh-frozen plasma (FFP). However, the virucidal efficacy of the SD method regarding HIV, HBV and HCV has been significantly better examined and proven than the MB treatment. Most of the therapeutic constituents of both plasma products are well maintained; coagulation factors decrease by roughly 5-20%. SD treatment reduces protein S and alpha 2-antiplasmin by approximately 40%, whereas MB treatment leads to a significant photooxidative alteration of fibrinogen with a disturbance of fibrin polymerization. As current studies show, the use of either plasma product is obviously not limited by acute or chronic toxicity. Several studies are in progress to evaluate the relevance of alterations in FFP quality which may affect the clinical efficacy of virus-inactivated plasma.
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