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Diagnosis and treatment of hypothyroidism in children
1Department of Pediatrics, Oregon Health Sciences University, Portland 97201.
Insights
Congenital hypothyroidism, a common newborn endocrine disorder, requires early screening and levothyroxine treatment to prevent intellectual disability. Prompt diagnosis and management ensure excellent prognosis for most infants with this thyroid condition.
Area of Science:
- Pediatric Endocrinology
- Neonatal Screening
- Thyroid Disorders
Background:
- Congenital hypothyroidism affects 1 in 4000 newborns, potentially causing severe developmental issues if untreated.
- Key clinical signs include prolonged jaundice, hypotonia, and macroglossia, though screening is crucial for early detection.
- Ectopic thyroid glands are the most frequent cause, with autoimmune factors implicated in some cases of thyroid dysgenesis.
Purpose of the Study:
- To highlight the importance of newborn screening for congenital hypothyroidism.
- To outline the diagnostic criteria and treatment protocols for congenital hypothyroidism.
- To discuss the long-term prognosis and potential risks associated with congenital hypothyroidism.
Main Methods:
- Diagnosis confirmed by low serum free T4/total T4 and elevated serum TSH.
- Treatment involves levothyroxine with careful monitoring of growth and development.
- Follow-up ensures normal serum T4 and TSH levels and optimal neurodevelopmental outcomes.
Main Results:
- Early detection and levothyroxine treatment lead to excellent prognoses, with normal IQs in most infants.
- Severe cases with low T4 and thyroid aplasia carry a higher risk of neurological sequelae.
- Acquired hypothyroidism in school-age children, often due to chronic lymphocytic thyroiditis, is reversible with treatment.
Conclusions:
- Newborn screening programs are vital for identifying congenital hypothyroidism early.
- Timely levothyroxine treatment is essential for preventing cognitive impairment and ensuring normal development.
- While prognosis is generally excellent, vigilance is needed for infants with severe presentations.
Abstract:
Congenital hypothyroidism is a relatively common endocrine disorder, affecting one in 4000 newborn infants. Undiagnosed and untreated congenital hypothyroidism will result in un-toward consequences, including mental retardation and other significant neurologic sequelae. For these reasons, programs to screen newborns were developed to detect congenital hypothyroidism before clinical features become obvious enough to suggest the diagnosis. The most common clinical features include prolonged jaundice, skin mottling, hypotonia, umbilical hernia, constipation, and macroglossia. Congenital hypothyroidism may be caused by several different disorders; ectopic thyroid glands represent the most common cause. There is accumulating evidence that autoimmune thyroid disease as manifested by TBII may be the cause of thyroid dysgenesis in some cases. The diagnosis is easily confirmed by finding a low serum free T4 or total T4 and elevated serum TSH concentration. The treatment of choice is levothyroxine; these infants must be followed carefully to ensure normal growth and development and maintenance of serum T4 and TSH within the normal ranges. With appropriate treatment and follow-up, the large majority of these infants have an excellent prognosis, with an IQ no different from comparison populations. However, it appears that there is still a small percentage of infants who are the most severely affected, who manifest the lowest serum T4 levels, thyroid aplasia, and retarded bone ages, and who may run the highest risk for some degree of retardation and other neurologic sequelae. Acquired hypothyroidism is also a relatively common disorder, occurring in one in 500 to one in 1000 school-age children. These children most commonly have a slowdown in growth, short stature, a goiter, and a drop in school performance. Other clinical features may be subtle or absent except in more severe or long-standing cases. The most common cause is chronic lymphocytic thyroiditis. The diagnosis is easily established by finding low serum-free T4 or total T4 and elevated serum TSH concentrations. Again, levothyroxine is the treatment of choice. With appropriate treatment and follow-up, all clinical features that develop after age 3 should be reversible and the prognosis should therefore be very good.