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Related Experiment Videos

Optimizing stent expansion with new stent delivery systems.

Y Takano1, L A Yeatman, J R Higgins

  • 1University of California, Los Angeles Center for Health Sciences, Los Angeles, California 90095-1717, USA.

Journal of the American College of Cardiology
|November 13, 2001
PubMed
Summary
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Intravascular ultrasound imaging.

Trends in cardiovascular medicine·2011

Newer coronary stents, despite high-pressure inflation, do not fully expand to the manufacturer's expected size. Intravascular ultrasound (IVUS) shows achieved stent cross-sectional area (CSA) is only 62% of the intended area, impacting optimal stent deployment.

Area of Science:

  • Cardiovascular Interventions
  • Medical Device Engineering
  • Diagnostic Imaging

Background:

  • Early coronary stents often required post-deployment balloon sizing or higher pressures for adequate expansion.
  • Modern stent delivery systems utilize noncompliant, high-pressure balloons to improve stent expansion.

Purpose of the Study:

  • To evaluate if contemporary stent delivery systems achieve a stented lumen cross-sectional area (CSA) matching the delivery balloon's nominal dimensions.
  • To assess the effectiveness of newer stent designs and delivery systems in achieving full expansion.

Main Methods:

  • Intravascular ultrasound (IVUS) assessed 38 stents in 32 patients post-deployment at 14-16 atm.
  • Measured minimum stent lumen CSA and diameter (MLD) using IVUS.
  • Compared IVUS measurements to manufacturer's expected stent dimensions derived from balloon diameter at maximum pressure.

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Main Results:

  • IVUS revealed significantly smaller MLD (2.5 mm) and minimum stent CSA (6.0 mm²) compared to manufacturer's expected values (3.5 mm and 9.5 mm²).
  • The achieved MLD was 72% and the minimum stent CSA was 62% of the expected dimensions.
  • Statistical analysis showed a significant difference (p < 0.0001).

Conclusions:

  • Even with moderately high-pressure inflations, the mean minimum stent CSA achieved was only 62% of the manufacturer's expected area.
  • IVUS findings highlight potential under-expansion of coronary stents.
  • Consideration of these IVUS observations is crucial for optimizing stent deployment during coronary artery stenting.