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Updated: Jul 6, 2026

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
08:42

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research

Published on: October 22, 2014

Brachial artery flow-mediated vasodilation in patients with cardiac syndrome X

Ai-Hsien Li1, Bai-Chin Lee, Kuo-Chin Chen

  • 1Department of Biomedical Engineering, Chung Yuan Christian University, Chung-Li City, Taiwan.

Angiology
|April 5, 2008
PubMed

Insights

Cardiac Syndrome X (CSX) involves microvascular dysfunction and endothelial impairment. CSX patients exhibit poorer endothelial function than controls, but less severe than coronary artery disease (CAD) patients.

Area of Science:

  • Cardiology
  • Vascular Biology
  • Endothelial Function

Background:

  • Cardiac Syndrome X (CSX) is defined by angina and normal coronary arteries, suggesting a microvascular origin.
  • Endothelial dysfunction is the suspected underlying mechanism in CSX.
  • Coronary Artery Disease (CAD) also involves endothelial dysfunction, providing a comparative basis.

Purpose of the Study:

  • To compare endothelial function in patients with CSX, CAD, and healthy controls.
  • To investigate the role of endothelin-1 in CSX pathophysiology.
  • To utilize brachial artery flow-mediated vasodilation as a measure of endothelial health.

Main Methods:

  • Assessed endothelial function using brachial artery flow-mediated vasodilation in CSX, CAD, and control groups.
  • Measured serum endothelin-1 levels, a potent vasoconstrictor, in all participants.
  • Employed a standardized 2-step brachial artery flow-related vasodilatation test.

Main Results:

  • CSX patients showed reduced brachial artery dilation compared to controls, but greater dilation than CAD patients.
  • Endothelin-1 levels were higher in controls and CSX patients than in CAD patients.
  • Endothelial function was impaired in CSX patients relative to controls, and further impaired in CAD patients.

Conclusions:

  • CSX is characterized by significant endothelial dysfunction, more pronounced than in healthy individuals.
  • Endothelial dysfunction in CSX is less severe than in established Coronary Artery Disease.
  • Microvascular impairment and elevated endothelin-1 may contribute to the pathophysiology of Cardiac Syndrome X.

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