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[Late complications after alloplastic vascular replacement].
1Abteilung für Allgemein-, Gefäss- und Thoraxchirurgie, Allgemeines Krankenhaus Harburg, Eissendorfer Pferdeweg 52, 21075 Hamburg.
Kongressband. Deutsche Gesellschaft Fur Chirurgie. Kongress
|February 5, 2002
Summary
Polyester grafts used for abdominal aortic aneurysm (AAA) repair show early mesh expansion but late degradation. Despite this, conventional grafts remain durable compared to newer endovascular options.
Area of Science:
- Vascular Surgery
- Biomaterials Science
- Medical Device Engineering
Background:
- Conventional grafts for abdominal aortic aneurysm (AAA) repair, including polyester and polytetrafluoroethylene (PTFE), have been widely used.
- Understanding the long-term durability and failure modes of these grafts is crucial for patient outcomes and device development.
Purpose of the Study:
- To evaluate the long-term dilation, degradation, and rupture patterns of conventional polyester and PTFE grafts used in AAA repair.
- To compare the durability of these conventional grafts with modern endovascular grafts.
Main Methods:
- Follow-up study of 273 patients who underwent AAA repair with polyester grafts between 1981-1985.
- Analysis of 436 explanted polyester and PTFE grafts from 75 hospitals to assess causes of explantation, focusing on rupture.
Main Results:
- Polyester grafts exhibited significant early dilation (mean 17.4% in 12 days, 34.8% in 3 years) due to mesh expansion, with no clinical relevance.
- Late dilation after approximately 10 years was attributed to material degradation.
- Graft rupture occurred in 16% of explanted polyester grafts and 5% of PTFE grafts, predominantly near the inguinal ligament after 10-20 years.
Conclusions:
- Early graft dilation in polyester grafts is a mechanical phenomenon without clinical impact.
- Late graft failure, including rupture, is linked to material degradation over time.
- Conventional polyester and PTFE grafts demonstrate significant long-term durability, establishing them as a gold standard when compared to contemporary endovascular grafts.