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Haemoglobin E beta thalassaemia in Sri Lanka
A Premawardhena1, C A Fisher, N F Olivieri
1National Thalassaemia Centre, General Hospital, Kurunegala, Sri Lanka.
Lancet (London, England)
|October 26, 2005
Summary
Haemoglobin E beta thalassaemia, common in Asia, shows diverse clinical outcomes. Many patients can be managed without transfusions, even with low haemoglobin levels, suggesting new cost-effective approaches.
Area of Science:
- Hematology
- Genetics
- Clinical Medicine
Background:
- Haemoglobin E beta thalassaemia is a prevalent severe thalassaemia in Asia.
- Limited understanding exists regarding its natural history, clinical variability, and optimal management strategies.
Purpose of the Study:
- To investigate the natural history and clinical diversity of Haemoglobin E beta thalassaemia.
- To evaluate transfusion management and identify factors influencing disease presentation.
- To explore alternative, cost-effective management approaches.
Main Methods:
- A longitudinal study of 109 Sri Lankan patients with Haemoglobin E beta thalassaemia over 5 years.
- Analysis of transfusion practices, including cessation in some patients.
- Identification of genetic and environmental factors impacting phenotype.
Main Results:
- Transfusion was not administered to 25 patients and was discontinued in 37 without adverse effects.
- Genetic modifiers of haemoglobin F, malaria exposure, and age-related adaptive changes were linked to phenotypic diversity.
- Many patients tolerated low haemoglobin levels without transfusion.
Conclusions:
- Haemoglobin E beta thalassaemia management can often exclude transfusions, even with significant anaemia.
- Phenotypic diversity is influenced by multiple genetic and environmental factors.
- Age-specific adaptations suggest potential for developing more cost-effective management strategies.
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