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Non-invasive Assessment of Microvascular and Endothelial Function
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Non-invasive Assessment of Microvascular and Endothelial Function

Published on: January 29, 2013

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Noninvasive assessment of endothelial function and vascular parameters in patients with familial and nonfamilial

Paweł Lewandowski, Marzena Romanowska-Kocejko, Agnieszka Węgrzyn

    Polskie Archiwum Medycyny Wewnetrznej
    |September 5, 2014
    PubMed

    Insights

    Familial hypercholesterolemia (FH) and high LDL cholesterol without FH mutations show reduced flow-mediated dilation, indicating endothelial dysfunction. Arterial stiffness did not differ, suggesting FH mutation isn't the sole cause in younger patients.

    Area of Science:

    • Cardiovascular Medicine
    • Genetics
    • Vascular Biology

    Background:

    • Endothelial dysfunction is a key indicator of atherosclerosis.
    • Elevated low-density lipoprotein (LDL) cholesterol is a primary risk factor for cardiovascular disease.
    • Familial hypercholesterolemia (FH) represents a severe genetic form of hypercholesterolemia.

    Purpose of the Study:

    • To assess endothelial function using flow-mediated dilation (FMD) in patients with FH and non-FH hypercholesterolemia.
    • To measure brachial arterial stiffness parameters in these patient groups and compare them to healthy controls.
    • To investigate the role of FH mutations versus high LDL cholesterol in endothelial dysfunction and arterial stiffness.

    Main Methods:

    • Ultrasound imaging was used to measure endothelium-dependent FMD and endothelium-independent dilation (EID) in the brachial artery.
    • Echo-tracking and photoplethysmography were employed to assess arterial stiffness parameters.
    • The study included 60 participants: 21 with confirmed FH, 19 with high LDL without FH mutations, and 20 healthy controls.

    Main Results:

    • Flow-mediated dilation (FMD) was significantly lower in both FH and non-FH groups compared to controls (P <0.01 and P <0.05, respectively).
    • Endothelium-independent dilation (EID) and arterial stiffness parameters showed no significant differences between the three groups.
    • These findings suggest endothelial dysfunction is present in hypercholesterolemia regardless of FH mutation status.

    Conclusions:

    • Reduced FMD indicates endothelial dysfunction in patients with elevated LDL cholesterol.
    • The absence of significant differences in arterial stiffness suggests that vascular remodeling is not advanced in these hypercholesterolemic patients.
    • The similar FMD and arterial stiffness between FH and non-FH groups imply that the FH mutation itself may not be the primary determinant of early vascular changes in younger individuals with hypercholesterolemia.
    Abstract

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