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Iatrogenic Subclinical Hyperthyroidism Does Not Promote Weight Loss.

Rohit Kedia1, Alicia Lowes1, Sarah Gillis1

  • 1From the Department of Internal Medicine, Boonshoft School of Medicine, Wright State University, Dayton, Ohio, and the Department of Internal Medicine, University of Nebraska Medical Center, Omaha.

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Summary
This summary is machine-generated.

Patients with thyroid cancer who underwent total thyroidectomy did not experience different long-term weight changes whether kept in subclinical hyperthyroid (SCH) or euthyroid states. Levothyroxine use to induce SCH did not impact weight compared to euthyroid patients.

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Area of Science:

  • Endocrinology
  • Thyroidology
  • Metabolic Research

Background:

  • Total thyroidectomy is a common procedure for thyroid cancer and benign thyroid disease.
  • Post-thyroidectomy management often involves levothyroxine replacement therapy.
  • The impact of induced subclinical hyperthyroidism (SCH) on long-term weight changes after thyroidectomy remains an area of investigation.

Purpose of the Study:

  • To investigate whether patients with thyroid cancer, following total thyroidectomy, exhibit different long-term weight changes when maintained in a state of iatrogenic subclinical hyperthyroidism (SCH) compared to euthyroid patients.
  • To assess the effect of levothyroxine therapy aimed at inducing SCH on weight dynamics post-thyroidectomy.

Main Methods:

  • Retrospective study analyzing medical records of 291 patients who underwent thyroidectomy.
  • Patients were categorized into subclinical hyperthyroid (SCH) and euthyroid groups.
  • Weight, thyroid-stimulating hormone levels, and levothyroxine dosage were recorded pre-surgery and at 1, 2, and 3 years post-surgery.

Main Results:

  • Both SCH and euthyroid groups showed weight gain from baseline at all measured time points (1, 2, and 3 years post-surgery).
  • There was no statistically significant difference in weight change from baseline between the SCH group and the euthyroid group at any of the follow-up periods.
  • Specific weight change percentages at year 3 were: SCH group mean 2.6% ± 9.2% gain, euthyroid group mean 3.1% ± 11.1% gain (P = 0.49).

Conclusions:

  • In patients who have undergone total thyroidectomy, maintaining a state of subclinical hyperthyroidism (SCH) does not lead to significant differences in long-term weight change compared to euthyroid patients.
  • The use of levothyroxine to intentionally induce SCH in the post-thyroidectomy setting did not result in differential long-term weight changes when compared to euthyroid management.