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Published in: Hernia 2/2015

01-04-2015 | Original Article

An experimental comparison of the effects of bacterial colonization on biologic and synthetic meshes

Authors: William C. Cole, Eric M. Balent, Pamela C. Masella, Lauren N. Kajiura, Karen W. Matsumoto, Lisa M. Pierce

Published in: Hernia | Issue 2/2015

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Abstract

Purpose

Biologic meshes are being used with increasing frequency to repair contaminated abdominal wall defects despite high long-term recurrence and infection rates associated with their use. Recent clinical reports describing the success of lightweight, macroporous synthetic meshes in contaminated ventral hernia repairs have led some surgeons to challenge the belief that synthetics are contraindicated in contaminated fields. We aimed to determine whether a frequently used biologic mesh (StratticeTM) is more resistant to bacterial colonization than macroporous synthetic mesh (ParietexTM ProgripTM) after inoculation with two common pathogens.

Methods

Rats (n = 48) were implanted subcutaneously with StratticeTM or ProgripTM. Meshes were inoculated with sterile saline or a suspension containing 106 colony-forming units of Staphylococcus aureus or Escherichia coli prior to wound closure (n = 8 per subgroup). Meshes were explanted at 4 weeks and underwent microbiologic and histologic analyses.

Results

ProgripTM demonstrated superior bacterial clearance compared to StratticeTM (E. coli, 88 vs. 17 % clearance, p = 0.03; S. aureus, 75 vs. 50 %, p = 0.61; combined bacterial strains, 81 vs. 36 %, p = 0.02; respectively). In the StratticeTM group, severely degraded meshes were observed in 100 % of animals inoculated with E. coli (but 0 % inoculated with S. aureus). In contrast, all ProgripTM meshes remained intact regardless of inoculum. Scores for neovascularization were higher in the synthetic group irrespective of contamination (p < 0.05).

Conclusions

Biologic meshes may not be more resistant to bacterial colonization than reduced-weight synthetics, and their resistance may differ in response to different pathogens. The routine use of biologics in contaminated ventral hernia repair should be questioned, particularly in the presence of E. coli.
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Metadata
Title
An experimental comparison of the effects of bacterial colonization on biologic and synthetic meshes
Authors
William C. Cole
Eric M. Balent
Pamela C. Masella
Lauren N. Kajiura
Karen W. Matsumoto
Lisa M. Pierce
Publication date
01-04-2015
Publisher
Springer Paris
Published in
Hernia / Issue 2/2015
Print ISSN: 1265-4906
Electronic ISSN: 1248-9204
DOI
https://doi.org/10.1007/s10029-014-1290-0

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