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Related Experiment Videos

Relation between high-density lipoprotein cholesterol and peripheral vasomotor function.

Jeffrey T Kuvin1, Ayan R Patel, Mandeep Sidhu

  • 1Department of Medicine/Division of Cardiology, Tufts-New England Medical Center, Boston, Massachusetts 02111, USA. jkuvin@tufts-nemc.org

The American Journal of Cardiology
|July 31, 2003
PubMed
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Low high-density lipoprotein (HDL) cholesterol is linked to impaired endothelial function, a key factor in atherosclerosis. This study found a direct correlation between HDL levels and blood vessel vasodilation, suggesting a novel mechanism for cardiovascular risk.

Area of Science:

  • Cardiovascular Medicine
  • Lipidology
  • Vascular Biology

Background:

  • Low high-density lipoprotein (HDL) cholesterol is a common lipid abnormality in patients with coronary artery disease (CAD).
  • Endothelial dysfunction, characterized by impaired endothelium-dependent vasomotion, is also highly prevalent in CAD patients.
  • The relationship between HDL cholesterol levels and peripheral endothelial function in individuals evaluated for atherosclerosis remains unclear.

Purpose of the Study:

  • To investigate the correlation between high-density lipoprotein (HDL) cholesterol levels and endothelium-dependent vasomotion in patients undergoing evaluation for atherosclerosis.
  • To determine if HDL cholesterol is an independent predictor of peripheral endothelial function.

Main Methods:

  • Peripheral vascular endothelial function was assessed using high-resolution brachial artery ultrasound to measure flow-mediated dilation (FMD).

Related Experiment Videos

  • FMD was defined as the percent change in arterial diameter following 5-minute arterial occlusion.
  • All 151 subjects underwent stress testing with nuclear single-photon emission computed tomographic imaging to assess left ventricular ejection fraction and diagnose coronary artery disease.

    • Main Results:

    • Subjects with HDL cholesterol <40 mg/dl (n=39) exhibited significantly lower FMD (7.4±3.6%) compared to those with HDL cholesterol ≥40 mg/dl (11.0±5.5%, p<0.001).
    • A significant positive correlation was observed between FMD and HDL cholesterol levels (p<0.001).
    • Multivariate analysis identified HDL cholesterol as an independent predictor of FMD, indicating impaired endothelial function in subjects with low HDL.

    Conclusions:

    • Peripheral endothelial function is impaired in individuals with low HDL cholesterol and well-preserved in those with high HDL cholesterol.
    • Impaired endothelial function associated with low HDL cholesterol may represent a previously unrecognized mechanism contributing to the elevated risk of atherosclerosis.
    • These findings highlight the importance of HDL cholesterol in maintaining vascular health and suggest potential therapeutic targets for atherosclerosis prevention.