• Nicholas Sowers, Patrick C Froese, Mete Erdogan, and Robert S Green.
• From the Department of Emergency Medicine, Dalhousie University, Halifax, NS, Canada (Sowers, Froese, Green); the Department of Critical Care Medicine, Dalhousie University, Halifax, NS, Canada (Green); and Trauma Nova Scotia, Halifax, NS, Canada (Erdogan, Green).
• Can J Surg. 2015 Oct 1;58(5):335-42.

BackgroundThe impact of the age of stored red blood cells on mortality in patients sustaining traumatic injuries requiring transfusion of blood products is unknown. The objective of this systematic review was to identify and describe the available literature on the use of older versus newer blood in trauma patient populations.MethodsWe searched PubMed, Embase, Lilac and the Cochrane Database for published studies comparing the transfusion of newer versus older red blood cells in adult patients sustaining traumatic injuries. Studies included for review reported on trauma patients receiving transfusions of packed red blood cells, identified the age of stored blood that was transfused and reported patient mortality as an end point. We extracted data using a standardized form and assessed study quality using the Newcastle-Ottawa Scale.ResultsSeven studies were identified (6780 patients) from 3936 initial search results. Four studies reported that transfusion of older blood was independently associated with increased mortality in trauma patients, while 3 studies did not observe any increase in patient mortality with the use of older versus newer blood. Three studies associated the transfusion of older blood with adverse patient outcomes, including longer stay in the intensive care unit, complicated sepsis, pneumonia and renal dysfunction. Studies varied considerably in design, volumes of blood transfused and definitions applied for old and new blood..ConclusionThe impact of the age of stored packed red blood cells on mortality in trauma patients is inconclusive. Future investigations are warranted.

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