Thyroid Function and Ultrasonography Abnormalities in Lithium-Treated Bipolar Patients: A Cross-sectional Study with...

Area of Science:

• Endocrinology
• Psychiatry
• Medical Imaging

Background:

• Lithium is widely used for bipolar disorder.
• Lithium's effects on thyroid physiology are known but understudied with large sample ultrasonography.
• This study investigates detailed thyroid morphology and function in lithium-treated patients.

Purpose of the Study:

• To compare thyroid morphology, hormone levels, and antibodies in lithium-treated patients versus healthy controls.
• To assess the prevalence of thyroid abnormalities using ultrasonography in lithium users.
• To evaluate the sufficiency of blood tests for monitoring thyroid health in lithium-treated individuals.

Main Methods:

• Cross-sectional study of 84 lithium-treated bipolar disorder patients and 65 controls.
• Blood samples analyzed for free thyroxine (fT4), thyroid stimulating hormone (TSH), and thyroid antibodies.
• Thyroid ultrasonography performed to assess gland morphology and abnormalities.

Main Results:

• Lithium group showed significantly higher median TSH levels and thyroid volume.
• Higher prevalence of thyroid dysfunction, goiter, and ultrasonographically defined abnormalities in the lithium group.
• No significant differences in fT4 levels, autoimmunity, or Hashimoto's thyroiditis between groups.

Conclusions:

• Ultrasonographic follow-up may be beneficial for lithium-treated patients due to high rates of goiter and abnormalities.
• Monitoring solely by blood tests is insufficient, as 90% of patients with goiter were euthyroid.
• Larger prospective studies are needed to determine the necessity of routine ultrasonographic examinations.