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Paclitaxel stent coating inhibits neointimal hyperplasia at 4 weeks in a porcine model of coronary restenosis.

A W Heldman1, L Cheng, G M Jenkins

  • 1Division of Cardiology, Department of Pathology, Johns Hopkins School of Medicine, Baltimore, Md, USA. aheldman@jhmi.edu

Circulation
|May 23, 2001
PubMed
Summary
This summary is machine-generated.

Paclitaxel-coated coronary stents significantly reduced neointimal hyperplasia and luminal loss in pigs. This demonstrates their potential to prevent restenosis after angioplasty.

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Area of Science:

  • Cardiovascular Medicine
  • Biomedical Engineering
  • Pharmacology

Background:

  • Coronary stents can lead to restenosis due to neointimal hyperplasia despite limiting elastic recoil.
  • Paclitaxel, a microtubule-stabilizing drug, inhibits vascular smooth muscle cell proliferation and migration.
  • Paclitaxel-coated stents are investigated to prevent restenosis.

Purpose of the Study:

  • To evaluate the efficacy of paclitaxel-coated coronary stents in preventing neointimal hyperplasia.
  • To assess the dose-dependent effect of paclitaxel on restenosis in a porcine model.

Main Methods:

  • Palmaz-Schatz stents were coated with varying doses of paclitaxel (0-187 microgram/stent).
  • Stents were implanted in the left anterior descending coronary artery (LAD) of 41 minipigs.
  • Angiographic and morphometric analyses were performed after 4 weeks.

Main Results:

  • Paclitaxel dose significantly reduced the late loss index (angiographic luminal diameter loss) by up to 84.3%.
  • Neointimal area decreased by 39.5% and luminal area increased by 90.4% with the highest paclitaxel dose.
  • No significant inflammatory cells, aneurysm, or thrombosis were observed.

Conclusions:

  • Paclitaxel-coated stents demonstrated dose-dependent inhibition of neointimal hyperplasia and luminal encroachment in pigs.
  • These findings suggest a therapeutic benefit for paclitaxel-coated stents in preventing human coronary restenosis.
  • Further studies are needed to assess long-term effects.