To evaluate the effect of storage on apheresis platelets collected with a closed‐system blood cell separator, an in vitro investigation was performed, with measurements of pH, lactate, ATP, the ratio of ATP to the total adenine nucleotide content, and adenylate kinase. Unmodified apheresis platelets and apheresis platelets with plasma added were compared with conventional platelets stored in PL‐1240 or PL‐732 plastic containers. During 6 days of storage, there were similar changes in all variables with one exception: the extracellular activity of adenylate kinase was lower in apheresis platelets with plasma than in the other three groups (p < 0.01). In vivo studies were carried out with 111Indium‐labeled autologous platelets in eight volunteers. Apheresis platelets with 100 mL of plasma added were stored in two 1000‐mL containers (PL‐732) at 22° C during agitation. Platelets from one of the containers were labeled with 111Indium and transfused into the volunteer within 24 hours. Platelets from the other container were labeled after 5 days of storage and transfused into the same donor. There were no significant differences between apheresis platelets stored for 1 day and those stored for 5 days: the mean percentage of recovery was 58.4 and 57.6 percent, t½ was 69 and 67 hours, and the survival time was 5.5 and 5.6 days, respectively.
Transfusion – Wiley
Published: Nov 12, 1989
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