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Related Experiment Videos

Decrease in carotid intima-media thickness in hypothyroid patients after normalization of thyroid function.

Toshiki Nagasaki1, Masaaki Inaba, Yasuko Henmi

  • 1Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, 1-4-3, Asahi-machi, Abeno-ku, Osaka 545-8585, Japan.

Clinical Endocrinology
|November 18, 2003
PubMed
Summary

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Levothyroxine (L-T4) replacement therapy in hypothyroid patients significantly reduced common carotid intima-media thickness, a marker of atherosclerosis. This suggests L-T4 can reverse atherosclerosis progression in these patients.

Area of Science:

  • Cardiovascular Medicine
  • Endocrinology
  • Medical Diagnostics

Background:

  • Hypothyroidism is associated with accelerated atherosclerosis.
  • Common carotid intima-media thickness (CCA IMT) is a validated marker for early atherosclerosis.

Purpose of the Study:

  • To investigate if levothyroxine (L-T4) replacement therapy can reverse atherosclerosis in hypothyroid patients.
  • To assess changes in CCA IMT following L-T4 treatment.

Main Methods:

  • A case-control study involving 35 hypothyroid patients and 35 healthy controls.
  • CCA IMT was measured using high-resolution ultrasonography before and after 1 year of L-T4 treatment.
  • Thyroid function was normalized with L-T4 replacement therapy.

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Main Results:

  • Hypothyroid patients exhibited significantly higher basal CCA IMT compared to controls.
  • After 1 year of L-T4 treatment, CCA IMT significantly decreased in 34 of 35 patients, reaching levels comparable to controls.
  • CCA IMT reduction correlated with baseline total cholesterol, LDL cholesterol, and total/HDL cholesterol ratio.

Conclusions:

  • L-T4 treatment has the potential to reverse atherosclerosis progression in hypothyroid patients.
  • Elevated LDL cholesterol and total/HDL cholesterol ratio play a significant role in increased CCA IMT in hypothyroid individuals.