[Is there a relationship between hyperemesis gravidarum and hyperthyroidism?].

Area of Science:

• Endocrinology
• Obstetrics
• Reproductive Medicine

Context:

• Hyperemesis gravidarum (HG) is a severe form of nausea and vomiting during pregnancy.
• Thyroid dysfunction can occur during pregnancy and may be related to hormonal changes.

Purpose:

• To investigate the incidence and characteristics of thyroid stimulation in patients with hyperemesis gravidarum.
• To explore the correlation between thyroid function, human chorionic gonadotropin (hCG) levels, and HG severity.
• To assess the impact of thyroid stimulation on pregnancy outcomes.

Summary:

• A retrospective study of 48 hyperemesis gravidarum patients found that 22.9% exhibited thyroid stimulation, characterized by suppressed TSH and elevated FT4/FT3 levels.
• This HG-associated hyperthyroidism differs from autoimmune hyperthyroidism, as patients lack thyroid antibodies and classic thyrotoxicosis signs.
• Treatment with antithyroid medication normalized thyroid tests and improved symptoms in affected patients.
• Neither the degree of thyroid stimulation nor hCG levels significantly influenced HG severity or pregnancy outcomes, including gestational age at delivery and birth weight.

Impact:

• This study clarifies the relationship between thyroid function and hyperemesis gravidarum, suggesting hCG as a likely causative factor for thyroid stimulation.
• Findings indicate that HG-related thyroid stimulation is generally benign regarding pregnancy outcomes.
• The results support the use of antithyroid medication for symptomatic relief in HG patients with hyperthyroidism.