title: Storage of human platelets by freezing.
abstract: Prolonged, probably indefinite storage of viable and functional human platelets is now possible by freezing with dimethylsulfoxide (DMSO). These platelets have a nearly normal survival upon reinfusion and are capable of sustained hemostatic effectiveness in thrombocytopenic patients. Adaptation of the freezing technique for large-scale usage has more recently been achieved. The method is mainly based on the following principles: (1) use of plasma for suspension of the platelet concentrate; (2) gradual addition (0.5% every 2 min) of DMSO to a final concentration of 5% and its gradual removal; (3) a slow cooling rate of about 1 degree C per min and rapid thawing (in 1 min); (4) use of a polyolefin plastic bag for freezing; (5) a washing medium of 20% plasma in Hanks' balanced salt solution; (6) final resuspension of the platelets in 50% plasma in Hanks' solution.
mesh_terms: D000475:Alkenes; D001792:Blood Platelets / Q000502:physiology; D001793:Blood Preservation; D002470:Cell Survival / Q000187:drug effects; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D005615:Freezing; D006801:Humans; D007038:Hypotonic Solutions; D011108:Polymers
chemical_list: D000475:Alkenes; D007038:Hypotonic Solutions; D011108:Polymers; D004121:Dimethyl Sulfoxide