Two-Years Prospective Follow-Up Study of Subacute Thyroiditis

Area of Science:

• Endocrinology
• Thyroidology

Background:

• Subacute thyroiditis (SAT) is an inflammatory condition of the thyroid gland.
• Understanding early indicators and long-term thyroid volume changes in SAT is crucial for patient management.

Purpose of the Study:

• To identify early indicators of hypothyroidism in SAT patients.
• To track changes in thyroid volume over a two-year follow-up period in SAT patients.

Main Methods:

• Prospective follow-up study of 61 SAT patients over 2 years.
• Assessment of hypothyroidism incidence and thyroid volume changes.
• Statistical analysis using binary logistic regression and ROC curves.

Main Results:

• Thyroid volumes in SAT patients at 1 and 2 years were significantly smaller than initial volumes and healthy controls.
• SAT patients who developed hypothyroidism had smaller thyroid volumes.
• Early maximum thyroid-stimulating hormone (TSH) values within 3 months predicted hypothyroidism at 2 years (OR=1.18, p=0.032).
• Early maximum TSH showed high accuracy (AUC=0.866) in predicting hypothyroidism.

Conclusions:

• Thyroid volumes in SAT patients initially increase then decrease significantly over two years.
• Reduced thyroid volumes at 1 and 2 years, particularly in hypothyroid patients, are observed.
• Early maximum TSH is a reliable predictor for developing hypothyroidism 2 years post-SAT onset.