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Related Experiment Videos

Pseudointimal thrombogenicity changes in small arterial grafts.

J M Seeger1, M Borgeson, G Lawson

  • 1Department of Surgery, University of Florida, Gainesville.

Surgery
|June 1, 1990
PubMed
Summary

Platelet accumulation on prosthetic grafts like Dacron and PTFE initially decreases, then increases on Dacron, impacting graft patency. This study reveals how graft material influences healing and blood clot formation.

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Area of Science:

  • Biomaterials Science
  • Vascular Surgery
  • Biomedical Engineering

Background:

  • Prosthetic grafts undergo rapid protein coverage and cellular ingrowth post-implantation.
  • The development of graft pseudointima influences graft thrombogenicity and platelet reactivity.

Purpose of the Study:

  • To investigate the impact of graft porosity and thrombogenicity on platelet accumulation and pseudointima development.
  • To compare platelet reactivity and pseudointima characteristics between polytetrafluoroethylene (PTFE) and Dacron grafts.

Main Methods:

  • Indium 111-labeled platelet accumulation was measured on PTFE and Dacron grafts in canine carotid arteries at 1, 7, and 21 days.
  • Pseudointima structure, weight, and collagen content were analyzed.
  • Platelet accumulation on carotid autografts and dissected arteries served as controls.

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Main Results:

  • Platelet accumulation decreased on all grafts and arteries between days 1 and 7.
  • Dacron grafts showed a significant increase in platelet accumulation from day 7 to 21, exceeding day 1 levels.
  • PTFE grafts exhibited minimal increase in platelet accumulation, remaining below day 1 levels, with thinner pseudointima and less collagen compared to Dacron.

Conclusions:

  • Differences in pseudointimal development and platelet reactivity between Dacron and PTFE grafts correlate with their patency rates.
  • Dacron grafts had lower patency (78%) compared to PTFE grafts (89%), likely due to increased thrombogenicity.
  • Graft material properties significantly influence healing dynamics and long-term vascular graft performance.