Overview
Infant hypothyroidism caused by maternal drug exposure can result from transplacental transfer of certain medications that interfere with thyroid hormone synthesis or function, leading to developmental delays and other complications if not promptly diagnosed and treated 23.Diagnosis
Elevated TSH levels with low T4 in neonates 2.
Confirmatory thyroid function tests including free T4 levels 2.
Consider timing of exposure and specific maternal medications 23.Management
Initiate levothyroxine replacement therapy, typically starting at 10-15 mcg/kg/day, adjusting based on clinical response and TSH levels 2.
Regular monitoring of thyroid function tests to adjust dosing as needed 2.
Early intervention is crucial to prevent developmental delays 2.Special Populations
Pediatrics: Increased vigilance for adverse drug reactions, including neurodevelopmental disorders, due to in utero exposure 23.
Pregnancy: Monitoring and avoidance of known thyroid-disrupting medications during pregnancy is essential 2.Key Recommendations
Screen neonates exposed to maternal thyroid-disrupting medications for hypothyroidism with thyroid function tests 2 (Evidence: Moderate).
Initiate levothyroxine therapy promptly in confirmed cases of infant hypothyroidism, with dose titration based on clinical and biochemical parameters 2 (Evidence: Moderate).
Implement pharmacovigilance practices to monitor and report adverse drug reactions in pediatric populations, including those with in utero exposure 23 (Evidence: Expert opinion).References
1 Marcellus L. Bibliometric and Textual Analysis of Historical Patterns in Maternal-Infant Health and Nursing Issues in The Canadian NurseJournal, 1905-2015. The Canadian journal of nursing research = Revue canadienne de recherche en sciences infirmieres 2019. link
2 Bouquet É, Star K, Jonville-Béra AP, Durrieu G. Pharmacovigilance in pediatrics. Therapie 2018. link
3 Smith PB, Benjamin DK, Murphy MD, Johann-Liang R, Iyasu S, Gould B et al.. Safety monitoring of drugs receiving pediatric marketing exclusivity. Pediatrics 2008. link