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In vivo Patency of Endothelial Cell‐Lined Expanded Polytetrafluoroethylene Prostheses in an Ovine Model
Author(s) -
James Natalie L.,
Schindhelm Klaus,
Slowiaczek Peter,
Milthorpe Bruce,
Graham Anthony R.,
Munro Vince F.,
Johnson Graham,
Steele John G.
Publication year - 1992
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/j.1525-1594.1992.tb00530.x
Subject(s) - intimal hyperplasia , medicine , anastomosis , endothelial stem cell , in vivo , stenosis , polytetrafluoroethylene , prosthesis , surgery , vascular graft , fibronectin , tissue engineering , cell , biomedical engineering , chemistry , radiology , biology , in vitro , biochemistry , microbiology and biotechnology , organic chemistry , smooth muscle
The performance of small‐diameter vascular prostheses may be improved by implantation of grafts lined with endothelial cells. Expanded polytetrafluoroethylene (ePTFE) prostheses (4 mm × 40 mm) were coated with fibronectin (20 γg/ml), seeded with endothelial cells, and cultured for 48 h to produce a confluent, autologous endothelial cell lining. They were implanted as carotid interposition grafts in sheep. Seeded ePTFE grafts were compared with nonseeded ePTFE grafts and autologous carotid artery grafts. No anticoagulant or antiplatelet therapy was administered. making this a stringent test model for the thromboresistance of a small‐diameter prosthesis. After 13 weeks the patencies of seeded, nonseeded, and autologous artery grafts were 16% (116), 0% (0/6), and 100% (6/6), respectively. The one seeded graft that was patent was fully lined with endothelial cells and showed no stenosis. The remaining five seeded grafts were occluded by fibrous tissue and displayed substantial spindle cell hyperplasia. There was no apparent difference between the autologous artery grafts and normal arterial tissue, and the anastomoses showed no stenosis. The ovine model provides a conservative test of prosthesis survival and may be useful for study of graft failure.