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Related Experiment Videos

Intravascular elastography: from bench to bedside.

Chris L de Korte1, Johannes A Schaar, Frits Mastik

  • 1Thoraxcenter, Erasmus Medical Center, Rotterdam, Interuniversity Cardiology Institute of the Netherlands, Utrecht, The Netherlands.

Journal of Interventional Cardiology
|June 13, 2003
PubMed
Summary
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Intravascular ultrasound elastography accurately identifies vulnerable plaques by detecting high stress regions. This technique shows promise for clinical use in predicting plaque rupture risk.

Area of Science:

  • Cardiovascular Imaging
  • Biomedical Engineering
  • Pathology

Background:

  • Unstable atherosclerotic plaques with large lipid pools and thin fibrous caps are prone to rupture, leading to thrombotic events.
  • Macrophage infiltration and cap thinning increase stress, indicating plaque vulnerability.
  • Current imaging methods have limitations in assessing plaque mechanical properties and vulnerability.

Purpose of the Study:

  • To evaluate intravascular ultrasound (IVUS) elastography as a tool for assessing atherosclerotic plaque composition and vulnerability.
  • To determine the ability of IVUS elastography to identify high-stress regions indicative of rupture-prone plaques.
  • To validate the technique in vitro, in an animal model, and in patient studies.

Main Methods:

  • IVUS elastography was used to measure tissue deformation under intraluminal pressure.

Related Experiment Videos

  • In vitro validation involved diseased human coronary and femoral arteries to compare strain in different plaque types.
  • In vivo validation was performed in an atherosclerotic mini-pig model, followed by patient studies.

    • Main Results:

    • Significant differences in strain were observed between fibrous and fatty plaque tissues (P = 0.0012).
    • High strain regions at the lumen-vessel wall boundary demonstrated 88% sensitivity and 89% specificity for identifying vulnerable plaques.
    • Fatty plaques showed higher strain values than fibrous plaques in vivo, and soft plaques exhibited 1-2% strain, while calcified material showed low strain (0-0.2%).

    Conclusions:

    • Intravascular elastography is a valuable tool for assessing plaque composition and vulnerability.
    • The technique can identify high-stress areas associated with lipid pools and macrophage infiltration.
    • Three-dimensional elastography development holds potential for a clinically available tool to identify rupture-prone plaques.