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The pituitary-thyroid axis after hemithyroidectomy in euthyroid man.
The Journal of Clinical Endocrinology and Metabolism
|August 1, 1981
Summary
Thyroid-stimulating hormone (TSH) drives thyroid growth after surgery. Temporary increases in TSH, within normal limits, are key to thyroid recuperation and goiter development.
Area of Science:
- Endocrinology
- Thyroidology
Background:
- Euthyroid goiter pathogenesis is often TSH-dependent, yet elevated serum TSH is rarely observed.
- Understanding early thyroid growth events is crucial for thyroid disease research.
Purpose of the Study:
- To investigate the role of TSH in early thyroid growth following hemithyroidectomy.
- To analyze thyroid function dynamics in euthyroid patients after partial thyroid removal.
Main Methods:
- Studied thyroid function in eight euthyroid patients undergoing hemithyroidectomy.
- Monitored serum T4 and TSH levels, and TSH response to TRH preoperatively and at multiple time points postoperatively (2 days to 36 months).
Main Results:
- Serum T4 decreased within the euthyroid range 30-90 days postoperatively.
- Basal serum TSH significantly increased and remained elevated for 90 days.
- TSH response to TRH was exaggerated from day 15 to 90.
Conclusions:
- The recuperation phase post-hemithyroidectomy is TSH-dependent.
- Transient, within-normal-limit TSH elevations are critical for thyroid recovery.
- TSH plays a dominant role in goiter genesis, with a new steady state achieved after 3 years.