01-01-2004 | Original
Influence of surgical intervention in the immune response of severely injured patients
Published in: Intensive Care Medicine | Issue 1/2004
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Objective
Primary events such as severe injury and elective surgery cause a deterioration of the immune response measurable by reduction of expression of HLA-DR on monocytes or ex vivo LPS-induced TNFα production. The further influence of secondary surgery after severe injury on the immune response remains unresolved.
Design
Prospective observation study.
Setting
Surgical intensive care unit of an university hospital.
Patients
Sixteen severely injured patients with an ISS >25 points.
Measurements and results
On day 1 after trauma and immediately before secondary surgery, mean fluorescence intensity (MFI) of HLA-DR expression on monocytes and TNFα ex vivo synthesis was significantly reduced compared to healthy donors. Overall, surgical intervention during the second week after trauma caused no further reduction of HLA-DR expression on monocytes and of the ex vivo TNFα-synthesis. However, major surgery such as intramedullary nailing or pelvic osteosynthesis caused reduction of the HLA-DR expression and TNFα-synthesis, whereas, minor surgical interventions such as osteosynthesis on peripheral joints exhibited no significant effects on the immune response. Surgical intervention performed to clear septic foci normalised immune response by elevating HLA-DR expression on monocytes and ex vivo TNFα synthesis. Severe injury caused elevated serum IL-10 levels, whereas secondary surgery did not induce a further increase in serum IL-10 levels.
Conclusion
This study shows that initial trauma as well as major secondary surgery causes a suppression of immune functions, whereas minor secondary surgery does not cause significant immune disturbance.