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CD4 lymphocyte numbers after splenectomy in patients infected with the human immunodeficiency virus
C K Fairley1, D Spelman, A Street
1Department of Social and Preventive Medicine, Alfred Hospital, Prahran, Victoria, Australia.
Insights
Splenectomy significantly increases total CD4 counts in HIV patients, but not the percentage or ratio, suggesting CD4 counts may overestimate immune function post-surgery.
Area of Science:
- Immunology
- Virology
- Surgical Oncology
Background:
- Splenectomy's effect on CD4 lymphocyte counts in human immunodeficiency virus (HIV)-infected individuals is inconsistently reported.
- Understanding immune system changes post-splenectomy in HIV patients is crucial for clinical management.
Purpose of the Study:
- To retrospectively analyze the impact of splenectomy on CD4 lymphocyte counts and related immune markers in HIV-infected patients.
- To assess whether splenectomy alters CD4 counts, total lymphocyte counts, CD8 counts, and the CD4:CD8 ratio in this population.
Main Methods:
- Retrospective chart review of 10 HIV-infected patients who underwent splenectomy.
- Analysis of pre- and post-splenectomy CD4 counts, total lymphocyte counts, CD8 counts, and CD4:CD8 ratios.
Main Results:
- A significant increase in mean CD4 counts (2.1-fold), total lymphocyte counts (2.2-fold), and CD8 counts (2.3-fold) was observed post-splenectomy.
- No significant changes were found in the percentage of CD4 lymphocytes (P = 0.95) or the CD4:CD8 lymphocyte ratio (P = 0.76).
- Two patients developed symptoms of impaired immunity (oral candidiasis, weight loss with mouth ulcers) despite elevated CD4 counts post-splenectomy.
Conclusions:
- Splenectomy leads to a significant rise in absolute CD4 counts but does not alter the percentage of CD4 lymphocytes or the CD4:CD8 ratio in HIV-infected patients.
- Absolute CD4 counts may overestimate immune function in HIV patients after splenectomy.
- Further research is needed to conclusively determine the implications of these findings on immune status and clinical outcomes.
Abstract:
Splenectomy has been reported to alter inconsistently the CD4 lymphocyte numbers in patients infected with the human immunodeficiency virus (HIV). To further assess the effect of splenectomy we have retrospectively examined the charts of 10 patients who were infected with HIV and who had undergone splenectomy. There was a significant increase in the mean CD4 numbers following splenectomy (mean increase of 326/microliters, or 2.1-fold, P = 0.0009), the total lymphocyte numbers (mean increase of 1.55/ml, or 2.2-fold, P = 0.001) and in the CD8 lymphocyte count (mean increase of 968/microliters, or 2.3-fold, P = 0.014). No significant difference was observed in the percentage CD4 lymphocytes (P = 0.95) or in the CD4:CD8 lymphocyte ratio (P = 0.76). In two patients, symptoms suggestive of impaired immune function developed post-splenectomy, at a time when their CD4 lymphocyte numbers were markedly higher than their pre-splenectomy values. One developed oral candidiasis (CD4 960/microliters, percentage CD4 32%), and in one patient a 7 kg weight loss was associated with recurrent mouth ulcers (CD4 680/microliters, percentage CD4 7%). We conclude that the total CD4 count increases significantly after splenectomy while the percentage CD4 lymphocyte count and CD4:CD8 lymphocyte ratio do not. Our data suggest that the CD4 lymphocyte count overestimates the immune function in these patients, although our findings are not conclusive.
