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Early diagnosis of congenital hypothyroidism is crucial for cognitive development. Treatment before 6 weeks of age significantly improves intelligence quotient (IQ) and reduces long-term morbidity in affected children.
Area of Science:
- Pediatrics
- Endocrinology
- Developmental Psychology
Background:
- Neonatal thyroid screening programs aim to identify congenital hypothyroidism early.
- Untreated congenital hypothyroidism can lead to significant developmental issues.
- Retrospective data are needed to evaluate the long-term impact of diagnosis timing.
Purpose of the Study:
- To provide retrospective control data for a neonatal thyroid screening program.
- To examine the long-term problems in children with congenital hypothyroidism.
- To assess the relationship between diagnosis timing, IQ, and other morbidities.
Main Methods:
- Retrospective analysis of 141 hypothyroid children's data.
- Assessment of intelligence quotient (IQ) using the Weschler intelligence scale.
- Evaluation of behavioral, developmental, and physical problems in relation to diagnosis and IQ.
Main Results:
- Mean IQ was 79.5 in children with congenital hypothyroidism.
- Children diagnosed before 6 weeks had normal IQs.
- Diagnostic delay correlated with declining IQ, though some late-diagnosed cases showed improvement.
- Parental social class strongly associated with IQ.
- 25% were mentally retarded, 29% attended special schools.
- Clumsiness and squints were more prevalent in children with lower IQs.
Conclusions:
- Congenital hypothyroidism is linked to persistent neurological and functional impairments.
- Early treatment (before 6 weeks) largely reverses prenatal hypothyroidism's adverse effects.
- Timely diagnosis and intervention are critical for optimal neurodevelopmental outcomes.
Abstract:
In a study designed to provide retrospective control data for a neonatal thyroid screening programme, the problems of 141 hypothyroid children were examined. The mean IQ (Weschler intelligence scale) was 79.5 for children with congenital hypothyroidism but was normal in 6 children diagnosed before age 6 weeks. Diagnostic delay was associated with a steady decline in mean IQ but there was an improvement in some late diagnosed cases. A strong association was found between IQ and parental social class. Twenty five percent of the children were mentally retarded and 29% were at special schools; 54% of children at normal schools and 43% at special schools showed deviant behaviour. Other problems included clumsiness (26.2%) and squints (26.2%), and these were more common in children with a lower IQ. Congenital hypothyroidism is associated with persistent morbidity in many aspects of cerebral function. The adverse effects of prenatal hypothyroidism are largely reversible if treated before age 6 weeks.