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Choanal atresia associated with prenatal methimazole exposure: three new patients

P Barbero1, C Ricagni, G Mercado

  • 1Centro Nacional de Genética Médica, Buenos Aires, Argentina. pablo@genes.gov.ar

American Journal of Medical Genetics. Part A
|July 22, 2004
PubMed

Insights

Prenatal exposure to methimazole (MMI) may cause a distinct pattern of birth defects, including choanal atresia. This highlights potential risks of MMI during pregnancy, especially where it

Area of Science:

  • Pediatric Endocrinology
  • Teratology
  • Developmental Biology

Background:

  • Methimazole (MMI) is an antithyroid drug used during pregnancy.
  • Concerns exist regarding potential teratogenic effects of MMI.
  • Bilateral choanal atresia is a congenital condition affecting newborns.

Purpose of the Study:

  • To define a clinical pattern of methimazole embryopathy.
  • To investigate the association between prenatal MMI exposure and choanal atresia.
  • To assess the risks of MMI in pregnant populations.

Main Methods:

  • Case report of three pediatric patients.
  • Clinical examination and assessment of prenatal exposure history.
  • Comparison with existing literature on MMI embryopathy.

Main Results:

  • Three patients presented with bilateral choanal atresia and other malformations.
  • The observed pattern aligns with previously documented MMI embryopathy.
  • Methimazole exposure in utero is implicated in these congenital anomalies.

Conclusions:

  • A distinct MMI embryopathy pattern, including choanal atresia, is suggested.
  • Propylthiouracil is preferred over MMI in pregnancy where available.
  • MMI use in certain regions poses a significant risk to fetal development.

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