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Thyroid function in the sick very low-birth-weight infants
Insights
Transient hypothyroxinemia is common in very low-birth-weight (VLBW) infants, with low thyroxine (T4) levels correlating with mortality and neonatal illness. Further research is needed to understand thyroid function
Area of Science:
- Neonatalogy
- Endocrinology
- Pediatric Research
Background:
- Very low-birth-weight (VLBW) infants experience unique physiological challenges during the neonatal period.
- Thyroid hormone plays a critical role in infant development and metabolism.
- Postnatal thyroid function in VLBW infants requires further elucidation.
Purpose of the Study:
- To investigate the postnatal changes in thyroid function in VLBW infants.
- To assess the prevalence of transient hypothyroxinemia in this population.
- To explore the relationship between thyroid hormone levels, neonatal illness, and mortality.
Main Methods:
- Serial measurements of thyroxine (T4), free T4, triiodothyronine (T3), and thyroid-stimulating hormone (TSH) were conducted in VLBW infants.
- Data analysis included survivors and non-survivors, with one case of primary hypothyroidism excluded.
- Correlation analysis was performed to link thyroid hormone levels with clinical outcomes.
Main Results:
- Transient hypothyroxinemia was observed in 46.1% of VLBW survivors.
- Thyroxine (T4) and free T4 levels decreased postnatally, reaching a low at one week, then increased.
- Low T4 and free T4 levels were correlated with increased mortality and neonatal illness severity.
Conclusions:
- Postnatal thyroid function in VLBW infants is characterized by common transient hypothyroxinemia.
- Thyroid hormone status is linked to critical illness and mortality in VLBW infants.
- Further studies are warranted to examine the impact of thyroid function on developmental outcomes in VLBW infants.
Abstract:
This study was undertaken to determine postnatal changes in thyroid function in very low-birth-weight (VLBW) infants. A total of one-hundred VLBW infants participated. Serial examination of serum levels of thyroxine (T4), free T4, triiodothyronine (T3), and thyroid-stimulating hormone (TSH) was performed in the neonatal period. A total of eighty-nine infants survived to discharge, while eleven died during hospitalization. Transient hypothyroxinemia was found in forty-one (46.1 percent) of the survivors. One of the surviving infants had primary hypothyroidism. His data was excluded from the analysis. In the other eighty-eight surviving infants, TSH levels were within normal limits throughout the six-week study period. T4 and free T4 values decreased after the first day of life, reaching a nadir at one week of age, followed by progressive increases. The mean cord blood T3 level was very low; the serum T3 value increased progressively in the postnatal period. We found a correlation between low T4 and free T4 values and mortality and neonatal illness. Hypothyroxinemia was associated with critical illness. In conclusion, the postnatal changes in thyroid function in VLBW infants were characteristic, with transient hypothyroxinemia being common in these infants. Further investigation of the relationship between thyroid function, death, neonatal illness, and developmental outcome is warranted.