Safety and efficacy of bioabsorbable magnesium alloy stents in porcine coronary arteries

Ron Waksman, Rajbabu Pakala, Pramod K. Kuchulakanti, Richard Baffour, David Hellinga, Rufus Seabron, Fermin O. Tio, Eric Wittchow, Sonja Hartwig, Claus Harder, Roland Rohde, Bernd Heublein, Arnim Andreae, Karl Heinz Waldmann, Axel Haverich

Research output: Contribution to journalReview articlepeer-review

292 Scopus citations

Abstract

Objective: We aimed to determine the safety and efficacy of biobasorbable magnesium alloy stents in porcine coronary arteries. Bioabsorbable magnesium stents carry the potential to overcome the limitations posed by permanent metallic stents such as chronic inflammation, late stent thrombosis, prolonged antiplatelet therapy, and artifacts when imaged by multislice-computed tomography or magnetic resonance imaging. Methods: Magnesium alloy stents or stainless steel stents were randomly deployed in coronary arteries of domestic or minipigs. Domestic pigs were sacrificed at 3 days (n = 2) or 28 days, and minipigs at 3 months. Results: At 3 days, magnesium alloy stents were intact, but started to show signs of degradation by 28 days. There was no evidence of stent particle embolization, thrombosis, excess inflammation, or fibrin deposition. At 28 days and 3 months, neointimal area was significantly less in magnesium alloy stent segments (2.44 ± 0.88 mm2 and 1.16 ± 0.19 mm2) as compared with the stainless steel stent segments (5.03 ± 1.5 mm2 and 1.72 ± 0.68 mm 2, P < 0.001 and 0.02). Quantitative coronary analysis indicates that percentage area stenosis and percentage diameter stenosis in magnesium alloy stent segments improved significantly at 3 months as compared to 28 days. Despite decreased neointimal hyperplasia, lumen area of the magnesium alloy stented vessels did not improve significantly. Conclusion: Magnesium alloy stents are safe and are associated with less neointima formation; however, reduced neointima did not result in larger lumen.

Original languageEnglish (US)
Pages (from-to)607-617
Number of pages11
JournalCatheterization and Cardiovascular Interventions
Volume68
Issue number4
DOIs
StatePublished - Oct 2006
Externally publishedYes

Keywords

  • Bioabsorbable stents
  • Magnesium alloy
  • Restenosis

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

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