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Related Experiment Videos

Biliary endoprostheses. Plastic versus metal stents.

J Lammer1

  • 1Department of Radiology, Karl Franzens University and Medical School, Graz, Austria.

Radiologic Clinics of North America
|November 1, 1990
PubMed
Summary

Plastic biliary endoprostheses effectively treat malignant obstructive jaundice. Newer metal stents offer easier implantation and lower mortality, with design improvements potentially reducing reocclusion rates below plastic alternatives.

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Area of Science:

  • Gastroenterology
  • Interventional Radiology
  • Biomedical Engineering

Background:

  • Malignant obstructive jaundice is a significant clinical challenge.
  • Plastic biliary endoprostheses provide palliation but are prone to bacterial contamination and encrustation.
  • Metal endoprostheses present an alternative with different occlusion mechanisms.

Purpose of the Study:

  • To compare the efficacy and complication rates of plastic and metal biliary endoprostheses.
  • To investigate the mechanisms of reocclusion in both types of stents.
  • To evaluate the potential for improved metal stent design to reduce occlusion.

Main Methods:

  • Comparative analysis of clinical outcomes for plastic and metal biliary endoprostheses.
  • Examination of reocclusion mechanisms, including bacterial contamination, encrustation, and tumor ingrowth.

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  • Evaluation of stent design features, such as mesh spacing and stent length.

    • Main Results:

    • Plastic endoprostheses achieved 80-90% success in relieving jaundice but are susceptible to encrustation.
    • Metal stents, particularly the Wallstent, demonstrated lower tumor ingrowth rates (6.5%) compared to other designs (19-50%).
    • The 30-day mortality rate for metal stents (5%) was significantly lower than for plastic stents (15-24%).

    Conclusions:

    • Expandable metal endoprostheses offer advantages in ease of implantation and reduced mortality.
    • Optimizing metal stent design, such as narrowing mesh spacing, can mitigate tumor ingrowth and potentially lower occlusion rates.
    • Further improvements in metal stent design and length may enhance long-term patency for managing malignant obstructive jaundice.