[Maternal autoimmune thyroid disease: relevance for the newborn].
OBJECTIVE
Autoimmune thyroid disease is amongst the most frequent endocrine disorders during pregnancy. It is associated with an increase in perinatal morbidity, congenital defects, neurological damage, fetal and neonatal thyroid dysfunction. Maternal thyroid hormones play a key role in child neurodevelopment. We aimed to evaluate the thyroid function and the clinical course of neonates born from mothers with autoimmune thyroid disease during the first months of life in order to define the follow-up.


METHODS
We monitored thyroid function and clinical status during the first months in 81 newborns of mothers with autoimmune thyroid disease; 16 had Graves disease and 65 autoimmune thyroiditis.


RESULTS
A percentage of 4.93 newborns had congenital defects, and 8.64% neonates showed an increase in thyrotropin (TSH) (>9.5 μUI/mL 2 times) and required thyroxin within the first month of life. A 85.7% of these showed a negative newborn screening (due to a later increase of TSH). A higher TSH value in the newborn was related to an older age of the mother, higher levels of thyroid peroxidase (TPO) antibody during pregnancy and lower birth weight. A higher free thyroxine (FT4) value in the newborn was related to fewer days of life and mothers with Graves disease.


CONCLUSIONS
We recommend the evaluation of TSH, T4 and TPO antibodies before 10 weeks in all pregnant women with follow-up if maternal thyroid autoimmunity or disorders is detected. It is also recommended to test children's serum TSH and FT4 at 48 h of life in newborns of mothers with autoimmune thyroid disease and repeat them between the 2nd and 4th week in children with TSH>6 μUI/mL. Careful endocrine follow-up is advised in pregnant women and children if hyperthyroidism is detected.
Servicio de Pediatría, Hospital del Sureste, Arganda del Rey, Madrid, España. Electronic address: carmentemboury@hotmail.com.
M Carmen
MC
Temboury Molina
Servicio de Pediatría, Hospital de Fuenlabrada, Fuenlabrada, Madrid, España.
M José
MJ
Rivero Martín
Cátedra de Estadística, Escuela Superior de Ingenieros Industriales de Madrid, Madrid, España.
Jesús
J
de Juan Ruiz
Servicio de Neonatología, Hospital Infantil La Paz, Madrid, España.
Susana
S
Ares Segura
D000328:Adult; D000013:Congenital Abnormalities / Q000175:diagnosis / Q000209:etiology* / Q000517:prevention & control; D005260:Female; D005500:Follow-Up Studies; D006111:Graves Disease / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D006980:Hyperthyroidism / Q000175:diagnosis / Q000209:etiology / Q000517:prevention & control; D007037:Hypothyroidism / Q000175:diagnosis / Q000209:etiology / Q000517:prevention & control; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000175:diagnosis / Q000209:etiology* / Q000517:prevention & control; D008297:Male; D008875:Middle Aged; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis* / Q000503:physiopathology; D013967:Thyroiditis, Autoimmune / Q000175:diagnosis* / Q000503:physiopathology
Autoinmunidad tiroidea materna; Children born from mothers with autoimmune thyroid disease; Enfermedad de Graves en el embarazo; Hijo de mujer con enfermedad tiroidea autoinmunitaria; Hipotiroidismo; Hypothyroidism; Pregnancy in Graves disease; Thyroid autoimmunity in pregnancy