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Growth retardation, skeletal maturation and thyroid function in children with homozygous beta-thalassaemia
Insights
Children with beta-thalassaemia experience growth retardation, particularly during puberty. While hypothyroidism is common, it does not appear to cause the observed growth issues in these patients.
Area of Science:
- Pediatric Endocrinology
- Hematology
Background:
- Beta-thalassaemia is a genetic blood disorder associated with various complications.
- Growth retardation is a recognized issue in children with beta-thalassaemia.
- Thyroid dysfunction is also frequently observed in these patients.
Purpose of the Study:
- To investigate the relationship between growth rate, skeletal maturation, and thyroid function in children with beta-thalassaemia.
- To determine if hypothyroidism contributes to growth retardation in beta-thalassaemia.
Main Methods:
- Studied fifty children with beta-thalassaemia (ages 2-13) and fifty age- and sex-matched controls.
- Measured growth rate, skeletal maturation (bone age vs. height age), and thyroid function (T4, T3, TSH).
Main Results:
- Growth retardation was prevalent, increasing with age and affecting most subjects near puberty.
- Thyroid hypofunction (low T4/T3, high TSH) was present early and did not worsen with age.
- No significant correlation was found between thyroid function impairment and the severity of growth retardation.
- Discrepancy between bone age and height age did not differ significantly from controls.
Conclusions:
- Hypothyroidism in beta-thalassaemia is common but not the cause of growth retardation.
- Growth retardation in beta-thalassaemia is likely multifactorial and not solely attributable to thyroid dysfunction.
Abstract:
Growth rate, skeletal maturation and thyroid function were measured in fifty thalassaemic children (age 2-13 years) and in fifty controls (matched for sex and age who were not anaemic. Growth retardation was present in several patients during the first years of life and affected almost all subjects examined when they were approaching puberty. Discrepancy between bone and height age in patients was not significantly different from controls. The finding of low T4 and T3 with a high TSH indicated thyroid hypofunction. This finding, already present early in life, did not worsen with increasing age. In beta-thalassaemia hypothyroidism cannot be the cause of retarded growth since there is no relationship between the impairment in thyroid function and severity of growth retardation. In addition, height age was not different from bone age, while a discrepancy is a constant feature of low stature due to hypothyroidism.