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SUMMARY:  BACKGROUND: Red blood cell (RBC) transfusion in hemorrhagic shock is life saving. However, several clinical trials have shown that blood transfusion in the critically ill patient might be associated with adverse outcomes. Furthermore, an association between prolonged blood storage and adverse effects of RBC transfusion has been postulated. The aim of this study is to examine the effect of blood storage time on resuscitation outcome, in an animal model of hemorrhagic shock.  METHODS: 20 Wistar rats were phlebotomized in order to induce reversible hemorrhagic shock. Half of them were resuscitated with blood stored for a short period of time (4 days), and the other ones were resuscitated with blood stored for a prolonged time (14 days). Blood samples for hemoglobin, pH, lactate, bicarbonate and creatinine were drawn prior to the induction of shock and 24 h after resuscitation. Five days after resuscitation the animals were sacrificed, and liver, lung and kidney histology was examined.  RESULTS: At 24 h after bleeding, the hemoglobin levels decreased by 3.2 and 1.7 g/dl, the pH decreased by 0.008 and 0.001, while the lactate levels increased by 1.6 and 2.7 mg/dl in the fresh and old blood resuscitation groups, respectively, with no significant difference between the groups. A trend toward more severe renal damage occurred in the old compared to the fresh blood resuscitation group (p = 0.089).  CONCLUSION: The results of the present study show that in this animal model of hemorrhagic shock the duration of storage of RBCs used for transfusion did not affect the outcome of resuscitation.

Prolonged Blood Storage Does Not Effect Survival in an Animal Model of Hemorrhagic Shock