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Treating congenital hypothyroidism: maximum age limit up to which a socially compatible child is expected
1Institute of Child Health, Calcutta.
Insights
Early thyroxine treatment for congenital hypothyroidism in children significantly improves mental development. Starting therapy before six months of age is crucial for better cognitive outcomes and educability.
Area of Science:
- Pediatrics
- Endocrinology
- Developmental Biology
Background:
- Congenital hypothyroidism (CH) requires timely treatment with thyroxine.
- While physical growth is often normalized, mental development in CH can be variable.
- Early intervention is hypothesized to be critical for optimal neurodevelopment in CH.
Purpose of the Study:
- To compare developmental milestones, anthropometry, and intelligence quotient (IQ) in CH children treated before and after six months of age.
- To assess the impact of early versus late thyroxine initiation on cognitive and physical outcomes.
- To provide evidence for optimal treatment timing in CH, particularly in resource-limited settings.
Main Methods:
- A comparative study involving 48 infants diagnosed with congenital hypothyroidism.
- Participants received thyroxine therapy and were followed up for developmental and anthropometric assessments.
- Children were divided into two groups based on the initiation of thyroxine therapy: at or before 6 months, and after 6 months of age.
Main Results:
- Children treated before 6 months showed anthropometric measurements at or above the 50th percentile and an average mental age deficit of 5 months with IQs above 85.
- Children treated after 6 months had anthropometric measurements below the 50th percentile, an average mental age deficit of 14 months, and IQs between 50-70.
- Early thyroxine therapy (before 6 months) was associated with significantly better mental function and educability.
Conclusions:
- Initiating thyroxine therapy before 6 months of age in congenital hypothyroid children considerably improves mental function, leading to educable individuals.
- Late thyroxine therapy (after 6 months) results in mild to moderate mental retardation, necessitating special care.
- Early diagnosis and treatment of CH within the first six months of life are vital for salvaging brain function and enabling a self-supportive life, especially in developing countries.
Abstract:
It is has been known that the treatment with thyroxine in hypothyroid children results in normal physical growth, but mental development is less predictable. A comparative study of developmental milestones, anthropometry and intelligence quotient (IQ) in congenital hypothyroid children starting thyroxine therapy before and after 6 months of age was done. Forty-eight congenital hypothyroid children were enrolled. They were given thyroxine and were followed up. In 18 cases who received thyroxine at or before 6 months of age their anthropometric measurements in majority were 50th percentile or above. Their mental age was deficient on an average by 5 months as compared to chronological age and their IQ was above 85. In rest of 30 cases where thyroxine was started after 6 months of age anthropometric measurements in majority were less than 50th percentile. Their mental age was deficient on an average by 14 months with IQ ranging between 50 and 70. Thyroxine therapy before 6 months of age considerably improved mental function so that they are educable. On the contrary those with late thyroxine therapy showed mild to moderate mental retardation and need special care. In developing country like ours if treatment of hypothyroidism can be started even by 6 months of age considerable brain function can be salvaged so that they can attain a self supportive life.