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Related Experiment Videos

Longitudinal plaque redistribution during stent expansion.

A Maehara1, A Takagi, H Okura

  • 1Center for Research in Cardiovascular Interventions, Stanford University Medical Center, California 94305-5637, USA.

The American Journal of Cardiology
|November 14, 2000
PubMed
Summary

Coronary stent expansion primarily involves vessel stretching and plaque redistribution, not plaque compression. This process shifts plaque from the stent

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Area of Science:

  • Cardiovascular Imaging
  • Interventional Cardiology
  • Biomedical Engineering

Background:

  • Coronary artery disease necessitates stent implantation to restore blood flow.
  • Understanding plaque behavior during stent expansion is crucial for optimizing treatment outcomes.

Purpose of the Study:

  • To elucidate the three-dimensional plaque dynamics during coronary stent expansion.
  • To differentiate between vessel wall changes and plaque volume alterations post-stenting.

Main Methods:

  • Serial intravascular ultrasound (IVUS) imaging was performed before and after stenting in 32 patients.
  • Cross-sectional areas of external elastic membrane (EEM), lumen, and plaque + media were measured at 1-mm intervals.
  • Volumetric analysis was conducted using Simpson's rule to assess changes in different arterial segments.

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Main Results:

  • Overall plaque + media volume remained unchanged post-stenting (p = 0.69).
  • Significant increases were observed in external elastic membrane (EEM) volume (p < 0.0001) and lumen volume (p < 0.0001).
  • Plaque + media volume decreased in the midstent zone but increased in the distal stent zone, indicating redistribution.

Conclusions:

  • Coronary stent expansion is characterized by vessel stretching and plaque redistribution, rather than plaque compression.
  • The observed lumen volume changes strongly correlate with EEM volume changes, highlighting the role of vessel expansion.
  • Plaque accumulation is effectively translated from the midstent to the distal stent regions.