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Postischemic blood flow response in hypercholesterolemic patients

D Hayoz1, R Weber, B Rutschmann

  • 1Division d'Hypertension, CHUV, Lausanne, Switzerland.

Hypertension (Dallas, Tex. : 1979)
|September 1, 1995
PubMed
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Hypercholesterolemia impairs forearm blood flow response to ischemia, but not radial artery function. Lipid-lowering therapy with simvastatin may restore this vascular response in hypercholesterolemic patients.

Area of Science:

  • Vascular Physiology
  • Cardiovascular Research
  • Metabolic Disorders

Background:

  • Hypercholesterolemia is a significant risk factor for cardiovascular disease.
  • The impact of hypercholesterolemia on arterial mechanical behavior and postischemic vascular response requires further elucidation.
  • Statins are widely used to manage hypercholesterolemia, but their specific effects on microvascular function need detailed study.

Purpose of the Study:

  • To compare the mechanical properties and postischemic blood flow response of the radial artery in newly diagnosed hypercholesterolemic patients, normocholesterolemic controls, and hypercholesterolemic patients treated with simvastatin.
  • To investigate whether simvastatin treatment improves vascular function in hypercholesterolemic individuals.

Main Methods:

  • Cross-sectional study involving three groups: newly diagnosed hypercholesterolemic, normocholesterolemic controls, and simvastatin-treated hypercholesterolemic patients.

Related Experiment Videos

  • High-resolution echotracking, Doppler ultrasound, and photoplethysmography were used to assess radial artery diameter, blood flow velocity, and blood pressure.
  • Forearm blood flow and flow-mediated dilation were measured after a 5-minute upper arm occlusion.

    • Main Results:

    • Radial artery cross-sectional compliance and distensibility were similar across all groups.
    • Flow-mediated dilation after ischemia did not differ significantly among the three groups.
    • Forearm blood flow increase post-ischemia was significantly blunted in untreated hypercholesterolemic patients compared to controls and treated patients.

    Conclusions:

    • Radial artery distensibility and flow-mediated dilation are preserved in hypercholesterolemia.
    • Forearm resistance vessels show a reduced postischemic blood flow response in untreated hypercholesterolemia.
    • Prolonged lipid-lowering intervention with simvastatin may restore impaired postischemic forearm blood flow response.