Thyroid hormone and immunological studies in endemic goiter.

Area of Science:

• Endocrinology
• Thyroid Disorders
• Iodine Metabolism

Background:

• Iodine deficiency is a common cause of goiter worldwide.
• Iodized oil injections are used to treat iodine deficiency disorders.
• The effects of iodized oil on thyroid hormone levels and autoantibodies require further investigation.

Purpose of the Study:

• To evaluate the effects of iodized oil administration on goiter size, thyroid function, and thyroid autoantibodies in goitrous patients.
• To investigate the potential occurrence of hyperthyroidism following iodized oil treatment.
• To assess changes in thyroxine-binding globulin (TBG) levels post-iodized oil administration.

Main Methods:

• 58 goitrous patients received 1 ml of iodized oil intramuscularly.
• Measurements included goiter size, urinary iodine, and serum levels of T4, T3RU, T3, rT3, TSH, TBG, and thyroid autoantibodies.
• These parameters were assessed at baseline and at 1, 3, and 6 months post-injection.

Main Results:

• Goiter size significantly decreased post-treatment.
• Serum TSH levels decreased, while T3RU and FTI increased due to decreased TBG.
• Thyroid autoantibodies became positive in 42.8% of patients, and 3 developed transient hyperthyroidism, associated with high autoantibody titers.

Conclusions:

• Transient hyperthyroidism can occur after iodized oil administration, potentially due to thyroid tissue necrosis and hormone leakage.
• A decrease in serum TBG levels following iodized oil administration was observed, a novel finding with an unknown underlying mechanism.
• Iodized oil is effective in reducing goiter size but requires careful monitoring for potential adverse effects like hyperthyroidism and TBG changes.