Evaluation of a heterologous pericardium immobilized with heparin as a vascular patch in a canine model

Yen-Chang, Chiun Nan Chen, Hsing Wen Sung, Yung Tsung Chiu, Jen Her Lu

Research output: Contribution to journalArticlepeer-review

Abstract

Heterologous pericardia, acquired from mammal, are often used as biological patches in cardiovascular surgery for pericardial substitute, intracardiac defect repair, stenosis enlargement, and change of blood stream direction. However, these biological patches have been clinically encountered with thrombus formation and tissue adhesion. These concerns may be overcome by immobilizing heparin on the surfaces of these biological patches. The study was to evaluate an epoxy-fixed porcine pericardium with ionically- or covalently-immobilized heparin implanted in a canine model as a vascular patch. The nonheparinized counterpart was used as a control. The results obtained suggested that surface-immobilized heparin may reduce thrombus formation and tissue adhesion of implanted biological patches. Additionally, the porcine pericardium with covalently-immobilized heparin was relatively better than its ionically-immobilized counterpart in reducing thrombus formation and tissue adhesion. Therefore, it is suggested that heparin be immobilized by stable covalent bond in clinical use. The resistance against in vivo degradation for the heparinized tissues (ionically- or covalently-immobilized) was relatively better than the nonheparinized tissue. However, heparinization did not seem to prevent the implanted biological tissues from calcification.

Original languageEnglish
Pages (from-to)357-366
Number of pages10
JournalJournal of the Chinese Institute of Chemical Engineers
Volume29
Issue number5
Publication statusPublished - Sep 1998
Externally publishedYes

Keywords

  • Biological patch
  • Covalently-immobilized heparin
  • Ionically-immobilized heparin
  • Thrombus formation
  • Tissue adhesion

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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