Fresh Red Blood Cells Transfusions No Better Than Older Ones

Red blood cells are stored in blood banks as red-cell units for up to 42 days. Some studies published over the past few decades have suggested that transfusion with red blood-cell units stored for longer periods might be less beneficial than transfusion with fresher red-cell units.

A large international team of scientists led by critical care staff at Sainte-Justine University Hospital Centre (Montreal, QC, Canada) undertook a randomized trial that recruited patients admitted to pediatric intensive care units in 50 medical centers. The study began in February 2014 and ended in November 2018. In the study there were 1,461 children ranging in age from 3 days to 16 years who were admitted to pediatric intensive care units and were recruited in the USA (29 sites), Canada (10 sites), France (eight sites), Italy (two sites), and Israel (one site); Sainte-Justine University Hospital was the coordinating center in Canada and recruited the greatest number of patients (over 160).

During the course of the study, half of the patients received transfusions with fresh red blood cells stored for seven days or less and half received transfusions with older red cells. The primary outcome measured was the development of new or progressive multiple-organ dysfunction (impairment of one or more organs). The team found that fresh red cells did not reduce the incidence of new or progressive multiple-organ dysfunction or death compared to older red cells and that the outcomes were not significantly different between the two groups. About 20.2% of those who received fresh red cells experienced new or progressive organ dysfunction, while 18.2% of those who received older red cells experienced similar dysfunction.

The study did not examine whether the use of the oldest red cells allowable (more than 35 days) affects outcomes, or whether fresh red cells affect outcomes for children requiring large-volume red cell transfusions. The children in this study received low-volume red cell transfusions. The authors concluded that among critically ill pediatric patients, the use of fresh red blood cells did not reduce the incidence of new or progressive multiple organ dysfunction syndrome (including mortality) compared with standard-issue red blood cells. The study was published on December 10, 2019 in the Journal of the American Medical Association.

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Sainte-Justine University Hospital Centre