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Does blood transfusion or hemorrhagic shock induce immunosuppression?
J I Cué1, J C Peyton, M A Malangoni
1Department of Surgery, University of Louisville School of Medicine, Kentucky.
The Journal of Trauma
|May 1, 1992
Summary
Hemorrhagic shock, not blood transfusions, significantly increases infection risk by affecting immune responses. Studies show shock impacts abscess size and macrophage Ia expression, while transfusions alone do not.
Area of Science:
- Immunology
- Transfusion Medicine
- Surgical Critical Care
Background:
- Blood transfusions are suspected to increase infection susceptibility through immunosuppression.
- The independent and combined effects of blood transfusion and hemorrhagic shock on immune function require clarification.
Purpose of the Study:
- To investigate whether blood transfusion or hemorrhagic shock (HS) impacts immune responses.
- To differentiate the effects of syngeneic (ST) and allogeneic (AT) transfusion with or without HS on infection risk markers.
Main Methods:
- Lewis rats underwent syngeneic or allogeneic blood transfusion (10-30% blood volume) or hemorrhagic shock.
- Animals were resuscitated with shed blood or ST/AT.
- Immune response was assessed via staphylococcal abscess size, peritoneal leukocyte elicitation, and macrophage Ia receptor expression.
Main Results:
- Hemorrhagic shock significantly increased abscess size (p<0.05).
- Neither ST nor AT, alone or with HS, affected abscess size.
- Both HS and transfusion increased macrophage Ia expression (p<0.05), but without additive effects.
- Peritoneal leukocyte elicitation remained unaffected by HS, ST, or AT.
Conclusions:
- Hemorrhagic shock, rather than blood transfusion, is the primary factor influencing infection risk.
- Immune modulation by HS is significant, while transfusion's role appears minimal in this context.