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[A non-invasive method for detecting endothelium-dependent dilation].

X Li1, J Li, S Zhao

  • 1Department of cardiovascular Medicine, Second Affiliated Hospital, Hunan Medical University, Changsha.

Hunan Yi Ke Da Xue Xue Bao = Hunan Yike Daxue Xuebao = Bulletin of Hunan Medical University
|January 1, 1997
PubMed
Summary

High-resolution ultrasound reveals that increased blood flow causes endothelium-dependent brachial artery dilation, while glyceryl trinitrate (GTN) induces endothelium-independent dilation in healthy individuals.

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Area of Science:

  • Cardiovascular Physiology
  • Vascular Biology
  • Diagnostic Ultrasound

Background:

  • Endothelial dysfunction is a key factor in cardiovascular disease.
  • Assessing endothelial function is crucial for cardiovascular risk assessment.
  • Non-invasive methods for evaluating vascular reactivity are highly sought after.

Purpose of the Study:

  • To evaluate endothelium-dependent and endothelium-independent brachial artery dilation using high-resolution ultrasound.
  • To compare the dilatory responses to reactive hyperemia and glyceryl trinitrate (GTN).
  • To establish a practical, non-invasive method for assessing endothelial function.

Main Methods:

  • High-resolution ultrasound was used to measure brachial artery diameter in 22 healthy subjects.

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  • Measurements were taken at rest, during reactive hyperemia, and after sublingual glyceryl trinitrate (GTN) administration.
  • Flow-mediated dilation (FMD) and GTN-induced dilation were quantified.

    • Main Results:

    • Brachial artery dilation was observed in response to both reactive hyperemia and GTN.
    • Mean flow-mediated dilation showed a 13.8% +/- 3.9% increment.
    • Mean dilation in response to GTN was 24.9% +/- 9.7%.
    • Both reactive hyperemia and GTN-induced dilation significantly differed from baseline (P < 0.01).

    Conclusions:

    • Increased blood flow mediates endothelium-dependent brachial artery dilation.
    • Glyceryl trinitrate (GTN) induces endothelium-independent brachial artery dilation.
    • High-resolution ultrasound provides a simple, secure, and practical method for detecting endothelium-dependent dilation.