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Differential effects of a gram-negative and a gram-positive infection on autogenous and prosthetic grafts.

Abstract：

:A canine model was developed to study the differential response of a gram-negative and a gram-positive bacterial infection on autogenous and prosthetic grafts. After replacing segments of the femoral arteries of 15 dogs with autogenous vein in one groin and polytetrafluoroethylene in the contralateral groin, 10(8) colony-forming units of nonmucin-producing Staphylococcus epidermidis (five dogs), Pseudomonas aeruginosa (five dogs), or sterile saline solution (five dogs) were directly inoculated onto the grafts. The grafts were examined 7 to 10 days after implantation. None of the control dogs exhibited inflammatory signs, and no grafts or anastomoses disrupted. S. epidermidis was unrecoverable from either graft material in any of the animals, although histologic evaluation confirmed neutrophils and bacteria in four of five animals in the vein and polytetrafluoroethylene groups. No dog inoculated with S. epidermidis had graft or anastomotic disruption. By contrast, P. aeruginosa was recovered from both types of grafts in all inoculated animals. Neutrophils, bacteria, and microabscesses were observed in all of these animals. In addition, three of five polytetrafluoroethylene grafts and all five vein grafts disrupted either at the anastomoses or in the body of the vein graft. Therefore S. epidermidis is a less virulent organism that may persist in graft walls despite negative cultures, whereas P. aeruginosa is a highly virulent organism that can disrupt native artery, vein grafts, and anastomoses. The graft material appears to be less important than the bacteria in determining the outcome of infection.

journal_name

J Vasc Surg

journal_title

Journal of vascular surgery

authors

Geary KJ,Tomkiewicz ZM,Harrison HN,Fiore WM,Geary JE,Green RM,DeWeese JA,Ouriel K

doi

10.1067/mva.1990.17626

subject

Has Abstract

pub_date

1990-02-01 00:00:00

pages

339-45; discussion 346-7

issue

2

eissn

0741-5214

issn

1097-6809

pii

0741-5214(90)90278-I

journal_volume

11

pub_type

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