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Relationship of endocrinopathy to iron chelation status in young patients with thalassaemia major
R G Grundy1, K A Woods, M O Savage
1Haemoglobinopathy Clinic, Queen Elizabeth Hospital for Children, London.
Insights
Iron overload in thalassemia patients receiving hypertransfusion can cause significant endocrine damage, including impaired growth hormone response and hypothyroidism. Regular monitoring is essential for early detection and management of these complications.
Area of Science:
- Endocrinology
- Hematology
- Pediatrics
Background:
- Hypertransfusion therapy for thalassemia can lead to iron overload.
- Iron overload is a known risk factor for endocrine dysfunction.
Purpose of the Study:
- To investigate the extent of endocrine dysfunction in thalassemia patients on hypertransfusion.
- To assess growth and pubertal development in this cohort.
Main Methods:
- Evaluated 18 thalassemia patients on hypertransfusion, 11 well-chelated.
- Assessed growth, puberty, and endocrine function, including growth hormone response to glucagon stimulation.
Main Results:
- Significant short stature observed in 5 patients.
- Impaired growth hormone response to glucagon in all patients with iron overload.
- Primary hypothyroidism in two patients; one with diabetes mellitus.
Conclusions:
- Even with optimal management, significant endocrine damage occurs in thalassemia patients.
- Close endocrine surveillance is crucial for patients with thalassemia receiving hypertransfusion.
Abstract:
Disturbances of growth and development in patients with thalassaemia receiving hypertransfusion programmes are well recognised and are most likely to be due to iron overload. The extent of endocrine dysfunction was investigated in a group of 18 patients thought to have been treated by acceptable modern standards, 11 of whom could be considered as well chelated. Assessment of growth and puberty showed a wide variation in height SD scores with five patients having significantly short stature. Most patients are progressing through puberty normally with the exception of two boys with marked pubertal delay. The most prominent finding was that growth hormone responses to glucagon stimulation were significantly impaired in all of the patients with iron overload. Basal endocrine assessment showed primary hypothyroidism in two patients aged 16.8 and 12.9 years with plasma thyroxine-concentrations of 86 and 59 nmol/l (normal range 65-165 nmol/l) and plasma thyroid stimulating hormone 10.2 and 30.3 mU/l (normal range 0.5-5 mU/l). One patient had diabetes mellitus. These results show that even when ideal management is sought a significant amount of endocrine damage occurs; surveillance of these patients is thus essential.