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Function of reticuloendothelial system in splenectomised thalassemics.
A Germenis1, P Dimitriou, H Vrettou
1Hellenic Red Cross Thalassemia Unit, Athens, Greece.
Blut
|November 1, 1988
Summary
Splenectomy in beta-thalassemia major patients alters reticuloendothelial system (RES) activity, reducing effective RES blood flow but maintaining phagocytic capacity. This suggests a modified RES response, potentially explaining infection susceptibility.
Area of Science:
- Hematology
- Immunology
- Medical Physiology
Background:
- Beta-thalassemia major is a severe inherited blood disorder requiring lifelong transfusions.
- Splenectomy is a common intervention in beta-thalassemia major to manage complications like hypersplenism.
- The reticuloendothelial system (RES) plays a crucial role in clearing opsonized particles and is affected by splenectomy.
Purpose of the Study:
- To investigate the activity of the reticuloendothelial system (RES) in patients with beta-thalassemia major after splenectomy.
- To compare RES function parameters between splenectomized thalassemics, non-splenectomized thalassemics, and healthy controls.
- To explore potential correlations between RES activity and clinical factors in splenectomized patients.
Main Methods:
- Assessed RES activity using the kinetics of 125I denatured human serum albumin in low and large doses.
- Calculated effective RES blood flow (ERBF) and maximum phagocytic capacity (PCmax).
- Compared parameters in 19 splenectomized beta-thalassemia major patients with historical data from non-splenectomized patients and 13 healthy controls.
Main Results:
- Splenectomized thalassemics exhibited significantly lower ERBF and PCmax compared to non-splenectomized patients (p < 0.001).
- Compared to healthy controls, splenectomized patients showed significantly lower ERBF (p < 0.001) but no significant difference in PCmax.
- No significant correlations were found between RES parameters and patient age, age at splenectomy, time since surgery, transfusion history, or serum ferritin levels.
Conclusions:
- In splenectomized beta-thalassemia major patients, the RES demonstrates altered activity, with reduced blood flow but preserved phagocytic capacity.
- The splenectomized RES appears to respond differently to hemolytic stimuli compared to the splenic RES in non-splenectomized individuals.
- These findings may partially explain the increased susceptibility to infections observed in splenectomized beta-thalassemia major patients.