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Thyrotoxicosis complicating pregnancy.

L E Davis1, M J Lucas, G D Hankins

  • 1Department of Obstetrics and Gynecology, University of Texas Southwestern Medical School, Dallas 75235-9032.

American Journal of Obstetrics and Gynecology
|January 1, 1989
PubMed
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Timely treatment of hyperthyroidism (overt thyrotoxicosis) in pregnancy improves outcomes. Early diagnosis and management lead to better maternal and infant health, reducing complications like preterm birth and heart failure.

Area of Science:

  • Obstetrics and Gynecology
  • Endocrinology
  • Perinatal Medicine

Background:

  • Pregnancy is complicated by overt thyrotoxicosis in approximately 1 in 2000 deliveries.
  • Thyrotoxicosis during pregnancy poses significant risks to both mother and fetus.

Purpose of the Study:

  • To evaluate the impact of treatment timing and control of hyperthyroidism on pregnancy outcomes.
  • To assess the morbidity associated with thyrotoxicosis diagnosed before versus during pregnancy.

Main Methods:

  • Retrospective analysis of 60 pregnant women with overt thyrotoxicosis from 1974-1985.
  • Treatment involved propylthiouracil, with doses adjusted based on clinical assessment.
  • Outcomes were correlated with metabolic status at delivery and timing of diagnosis.

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Main Results:

  • Early diagnosis and treatment were associated with higher rates of euthyroidism at delivery and better pregnancy outcomes.
  • Women diagnosed during pregnancy experienced greater morbidity, including stillbirths and heart failure.
  • Untreated or poorly controlled thyrotoxicosis led to increased preterm delivery, perinatal mortality, and maternal heart failure.

Conclusions:

  • Aggressive medical management of hyperthyroidism in pregnancy is warranted, particularly in advanced gestation.
  • Achieving euthyroidism, even with doses lower than typically recommended, is crucial for favorable maternal and perinatal outcomes.
  • Prompt diagnosis and treatment are key to mitigating the adverse effects of thyrotoxicosis during pregnancy.