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[Brief antiseptic application of iodine in neonatal intensive care units: effects on thyroid function]
Insights
Iodine antiseptics applied to neonates can cause transient thyroid dysfunction, indicated by elevated TSH and reduced T3 levels. This suggests using non-iodinated alternatives for umbilical care in newborns.
Area of Science:
- Neonatal endocrinology
- Thyroid function assessment
- Iodine exposure effects
Context:
- Neonatal intensive care units (NICUs) often use iodine-containing antiseptics for skin cleansing.
- Umbilical catheterization is a common procedure in neonates requiring specialized care.
- Thyroid hormone levels are critical for neonatal development.
Purpose:
- To investigate the impact of iodine-containing antiseptics on neonatal thyroid function.
- To compare thyroid screening results in iodine-exposed neonates versus controls.
- To evaluate the safety of iodine antiseptics in the neonatal population.
Summary:
- A study involving 37 neonates (21 exposed to iodine antiseptic, 16 controls) found significantly higher TSH and lower free T3 levels in the iodine-exposed group.
- Urinary iodine excretion was also significantly increased in neonates exposed to iodine antiseptics.
- Thyroid-stimulating hormone (TSH) elevations resolved within 15-30 days post-exposure.
Impact:
- Findings suggest that iodine antiseptics may induce transient thyroid dysfunction in neonates.
- The study supports the recommendation to consider non-iodinated antiseptic substances for neonatal umbilical care.
- This research contributes to understanding potential risks associated with common neonatal care practices.
Background:
Transient thyroid dysfunction with its adverse effects of diminished levels of thyroid hormone on mental development has been reported in neonates whose skin has been cleaned with iodine-containing substances. We report the results of thyroid screening in iodine-exposed neonates and controls.
Population And Methods:
Thirty seven neonates admitted to an intensive care unit from 1990 to 1992 and whose medical condition required umbilical catheterization were included in the study. There were 21 neonates (six term and 15 preterm) for whom the area around the umbilicus was cleansed with iodine antiseptic and 16 controls (four term and 12 preterm) for whom the antiseptic used did not contain iodine. Levels of serum free T3 and T4, and TSH were determined by 7 days after catheterization as did urinary iodine and creatinine concentrations.
Results:
Iodine-exposed neonates had significant high levels of TSH (P < 0.01) and low free T3 (P < 0.05); levels of free T4 were lower than in controls but not significantly. Urinary iodine excretion was significantly increased. The increase in TSH disappeared between 15 and 30 days after iodine application.
Conclusion:
Application of iodine antiseptics may cause transient thyroid dysfunction in neonates leading to propose the use of non iodinated substances with similar antibacterial efficacy.