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Neurological abnormalities in patients treated for hypothyroidism from early life
Insights
Early childhood hypothyroidism can cause widespread brain function impairment, affecting IQ within normal ranges. Despite treatment, neurological and psychological deficits persist, indicating a need for ongoing patient assessment.
Area of Science:
- Pediatric Endocrinology
- Neurodevelopmental Pediatrics
Background:
- Congenital hypothyroidism requires early intervention to prevent developmental issues.
- Long-term neurological and psychological effects of early-life hypothyroidism are not fully understood.
Purpose of the Study:
- To assess neurological and psychological outcomes in children treated for early-onset hypothyroidism.
- To evaluate the impact of treatment timing on neurodevelopmental deficits.
Main Methods:
- Neurological and psychological assessments were performed on 30 patients aged 2.7–21 years with early-onset hypothyroidism.
- IQ scores and specific functional impairments (motor, speech, behavior, learning, visual) were evaluated.
Main Results:
- Patients had normal IQ scores (mean 92.4), but 77% exhibited at least one sign of impaired brain function.
- Common deficits included squint (53%), minor motor disorders (50%), clumsiness (33%), and learning disorders (26%).
- Neurological findings were similar regardless of whether treatment began between 4–10 weeks or after 10 weeks of age.
Conclusions:
- Early-life hypothyroidism is associated with widespread, persistent brain function impairment, even with normal IQ.
- Neonatal screening benefits may be limited if treatment initiation timing does not prevent these deficits.
- Children with infantile hypothyroidism require comprehensive assessment to mitigate long-term difficulties.
Abstract:
Neurological and psycholocial assessment was carried out on 30 patients aged 2.7 to 21 years (mean 9.4) who were being treated for hypothyroidism starting before the age of 2 years. Their IQ scores lay in the normal range (71--122; mean 92.4) but 77% showed at least one sign of impaired brain function. Clumsiness was found in 33%, behaviour disorders in 23%, speech disorders in 20%, learning disorders in 26%, squint in 53%, nystagmus in 10%, and minor motor disorders in 50%. Many showed several of these features and hypothyroidism in early life appears to lead to widespeard impairment of brain function. These neurological findings were equally common in patients in whom treatment started between 4 and 10 weeks of age and patients treated after 10 weeks, suggesting that early detection of hypothyroidism by neonatal screening may be of limited benefit. Children who have been hypothyroid in early infancy require careful assessment to prevent further visual, emotional, scholastic, or vocational difficulties.