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Activities of liver cell-producing coagulation factors in thalassemic children
D Romcai1, T Tositarat, P Kulapongs
1Department of Clinical Microscopy, Chiang Mai University, Thailand.
Insights
Beta-thalassemia children show depressed levels of key clotting factors, indicating liver dysfunction. These coagulation abnormalities are linked to hepatic parenchymal cell involvement in beta-thalassemia.
Area of Science:
- Hematology
- Pediatric Medicine
- Clinical Biochemistry
Background:
- Beta-thalassemia is a genetic blood disorder.
- Coagulation factor deficiencies can occur in various chronic diseases.
- Liver function is crucial for synthesizing coagulation factors.
Purpose of the Study:
- To investigate coagulation profiles in children with beta-thalassemia.
- To assess the impact of splenectomy and vitamin K on coagulation.
- To explore the role of liver involvement in beta-thalassemia-related coagulation abnormalities.
Main Methods:
- Coagulation studies were performed on 20 children with beta-thalassemia and 16 controls.
- Factor activities including the prothrombin complex (II, VII, IX, X), V, I, and VIII were measured.
- Comparisons were made between splenectomized and non-splenectomized groups, and with/without vitamin K administration.
Main Results:
- Uniform depression in hepatic-synthesized factors (II, VII, IX, X, V, I) was observed in beta-thalassemia patients.
- Factor VIII activity remained normal.
- No significant differences in prothrombin complex activity were found based on splenectomy status or vitamin K use.
- Absence of factor VII cold-activation in thalassemia plasma suggests impaired liver function.
Conclusions:
- Beta-thalassemia is associated with impaired synthesis of hepatic coagulation factors, indicating liver involvement.
- Splenectomy and vitamin K administration did not significantly alter prothrombin complex activity.
- Further investigation into plasma kallikrein and HMW kininogen may elucidate the mechanisms of factor VII abnormalities.
Abstract:
Coagulation studies were carried out in 20 beta-thal children (five splenectomized) and 16 control children. It was found that the activities of factors II, VII, IX, and X (prothrombin complex group), V, and possibly I that are produced by hepatic parenchymal cells were uniformly depressed. Factor VIII activity was normal. There was no statistically significant difference in the prothrombin complex activity between the splenectomized and nonsplenectomized group, or those with and without parenteral vitamin K administration. The absence of "cold-activation" of factor VII in thal plasma, probably secondary to depressed activities of plasma kallikrein and HMW kininogen, further implicates liver involvement in these children.