Peripheral bone density in women with untreated multinodular goitre

Area of Science:

• Endocrinology
• Bone Metabolism
• Thyroid Disorders

Background:

• Multinodular goitre is a common thyroid condition.
• Subclinical hyperthyroidism, characterized by suppressed TSH with normal free T4 and T3, can affect various physiological processes.
• Bone density assessment is crucial for evaluating fracture risk.

Purpose of the Study:

• To investigate the relationship between subclinical hyperthyroidism in women with multinodular goitre and bone mineral density.
• To compare bone density in women with subclinical hyperthyroid goitre versus euthyroid goitre.

Main Methods:

• Bone density was measured at the distal and proximal forearm using single photon absorptiometry.
• Subjects included 23 women with subclinical hyperthyroid goitre and 54 women with euthyroid goitre, compared to 125 age- and menopause-matched controls.
• Thyroid stimulating hormone (TSH), free thyroxine (FT4), and total triiodothyronine (T3) levels were measured.

Main Results:

• Women with subclinical hyperthyroid goitre exhibited significantly lower Z-scores for both distal and proximal forearm bone density compared to those with euthyroid goitre.
• Median FT4 levels were higher in the subclinical hyperthyroid group, though still within the normal range.
• A significant inverse correlation was observed between FT4 levels and forearm bone density in the subclinical hyperthyroid group.

Conclusions:

• Untreated multinodular goitre associated with subclinical hyperthyroidism leads to reduced bone density in the forearm.
• These findings suggest that even mild thyroid overactivity can negatively impact bone health.
• Further research is warranted to explore the clinical implications and management strategies for bone loss in this patient population.