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[T4 and T8 lymphocytic populations after total hip replacement]
Insights
Postoperative lymphocytopenia occurs after surgery, but T-helper (CD4) and T-suppressor (CD8) cell percentages remain stable. Measuring these specific T-lymphocyte subsets is not more useful than total lymphocyte count for assessing surgical immunosuppression.
Area of Science:
- Immunology
- Surgical Trauma
Context:
- Sepsis following surgical trauma is linked to immunosuppression.
- Postoperative lymphocytopenia is a known complication.
- Previous studies on T-lymphocyte subsets (CD4 and CD8) have yielded conflicting results.
Purpose:
- To evaluate changes in T-helper (CD4) and T-suppressor (CD8) lymphocyte subpopulations after surgery.
- To minimize non-specific variations through standardized surgical conditions and blood collection timing.
Summary:
- Lymphocytopenia was confirmed 24 hours post-surgery.
- No significant differences were observed in the percentages of CD4 and CD8 T-lymphocytes.
- Standardized conditions included the same surgeon, surgical technique, and automated blood sample analysis.
Impact:
- Surgery does not alter the relative proportions of T-helper and T-suppressor cells within the first 24 postoperative hours.
- Measurement of CD4 and CD8 percentages offers no additional benefit over total lymphocyte count for assessing postoperative immunosuppression.
Abstract:
Immunosuppression is involved in the occurrence of sepsis after surgical trauma. A postoperative lymphocytopenia is a recognised fact. In the opposite, studies on T-lymphocytes helpers (CD 4) and suppressors (CD 8) resulted in conflicting results. The aim of this study was to assess the variations in these two T-lymphocyte sub-populations using strongly standardized conditions in order to minimize the risk of non specific variations: same surgeon, same surgical technique, blood samples collected just before induction, immediately and 24 hours after surgery, automatized measures (Technicon H1). The results confirmed the lymphocytopenia, 24 hours after surgery, but no differences on CD 4 and CD 8 percentages were noted. It is concluded that during the first 24 postoperative hours surgery does not change the relative proportions of T-helpers and T-suppressors. Their measurement is not more useful than total lymphocyte count for assessment of postoperative immunosuppression.