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Assessment of endothelial function using peripheral waveform analysis: a clinical application.

Christopher S Hayward1, Mustafa Kraidly, Carolyn M Webb

  • 1Cardiology Department, St. Vincent's Hospital, Sydney, New South Wales, Australia. chayward@stvincents.com.au

Journal of the American College of Cardiology
|July 27, 2002
PubMed
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Radial artery applanation tonometry effectively assesses endothelial function. Changes in the arterial waveform after Salbutamol (Salb) stimulation, linked to nitric oxide release, are reproducible and can differentiate patient groups, offering a noninvasive measurement method.

Area of Science:

  • Cardiovascular Physiology
  • Endothelial Function Assessment
  • Noninvasive Hemodynamics

Background:

  • Beta(2)-receptor stimulation is known to induce nitric oxide release.
  • Glyceryl trinitrate (GTN) significantly impacts arterial pressure waveforms.
  • Hypothesis: Changes in peripheral pressure waveform augmentation index (AIx) after Salbutamol (Salb) can assess endothelial function.

Purpose of the Study:

  • To evaluate radial artery applanation tonometry as a noninvasive method for assessing global endothelial function.
  • To investigate the relationship between Salbutamol-induced arterial waveform changes and nitric oxide release.
  • To compare endothelial function in coronary artery disease (CAD) patients versus healthy controls.

Main Methods:

  • Three-part study involving healthy subjects and CAD patients.

Related Experiment Videos

  • Administration of Salbutamol (Salb) and Glyceryl trinitrate (GTN) with waveform analysis.
  • Assessment of reproducibility and comparison between healthy controls and CAD patients.

    • Main Results:

    • Salbutamol (Salb) significantly decreased augmentation index (AIx) after control infusion but not after nitric oxide synthase inhibition (L-NMMA).
    • GTN-induced AIx decreases were similar regardless of prior infusion.
    • Salbutamol (Salb) induced smaller AIx changes in CAD patients compared to controls, indicating impaired endothelial function.

    Conclusions:

    • Peripheral arterial pressure waveform changes following Salbutamol (Salb) stimulation are sensitive and reproducible.
    • These changes correlate with nitric oxide release and can distinguish between clinical groups.
    • Arterial waveform analysis via tonometry offers a promising noninvasive method for measuring global arterial endothelial function.