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Simvastatin improves endothelial function in patents with subclinical hypothyroidism

Dursun Duman1, Sinan Sahin, Kenan Esertas

  • 1Department of Cardiology, Haydarpasa Numune Training and Research Hospital, Istanbul, Turkey. drduman@excite.com

Heart and Vessels
|March 29, 2007
PubMed

Insights

Simvastatin significantly improved endothelial function and lipid profiles in subclinical hypothyroidism patients. Levothyroxine (LT-4) showed no significant effect, suggesting simvastatin

Area of Science:

  • Endocrinology
  • Cardiovascular Medicine
  • Pharmacology

Background:

  • Subclinical hypothyroidism (SCH) is linked to impaired endothelial function, potentially due to dyslipidemia.
  • Endothelial dysfunction is a precursor to cardiovascular events.

Purpose of the Study:

  • To compare the effects of simvastatin and levothyroxine (LT-4) on lipid profiles and endothelial function in SCH patients.
  • To investigate the impact of dyslipidemia treatment on endothelial function in SCH.

Main Methods:

  • Randomized controlled trial with 59 newly diagnosed SCH patients.
  • Three groups: no treatment, LT-4, or simvastatin.
  • Assessment of endothelium-dependent vasodilation (EDV) and endothelium-independent vasodilation (EIV) at baseline and 8 months.

Main Results:

  • Simvastatin significantly reduced total cholesterol, triglycerides, and LDL-cholesterol.
  • Simvastatin treatment led to a significant increase in EDV (P < 0.01), correlating with LDL reduction.
  • LT-4 therapy showed a non-significant trend towards increased EDV; EIV remained unchanged in all groups.

Conclusions:

  • Simvastatin effectively improves brachial artery endothelial function and dyslipidemia in SCH patients.
  • The hypolipidemic effect of simvastatin may contribute to improved endothelial function.
  • LT-4 therapy did not demonstrate significant benefits for endothelial function in this cohort.

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