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A Novel Method to Determine the Longitudinal Antibacterial Activity of Drug-Eluting Materials
06:18

A Novel Method to Determine the Longitudinal Antibacterial Activity of Drug-Eluting Materials

Published on: March 3, 2023

Less-invasive and highly effective method for preventing methicillin-resistant Staphylococcus aureus graft infection

Hisashi Sakaguchi1, Akira Marui, Keiichi Hirose

  • 1Department of Cardiovascular Surgery, Kyoto University Graduate School of Medicine, Kyoto, Japan.

The Journal of Thoracic and Cardiovascular Surgery
|January 9, 2008
PubMed
Abstract

Insights

A novel vancomycin-eluting sheet effectively prevented methicillin-resistant Staphylococcus aureus graft infections in a murine model. This local sustained-release approach significantly reduced bacterial counts and improved survival rates.

Area of Science:

  • Biomaterials Science
  • Infectious Disease Research
  • Vascular Surgery

Background:

  • Prosthetic vascular graft infections, particularly by methicillin-resistant Staphylococcus aureus (MRSA), pose serious complications in vascular surgery.
  • Systemic vancomycin administration shows limited efficacy against established MRSA graft infections.
  • Developing localized treatment strategies is crucial for preventing and managing these infections.

Purpose of the Study:

  • To investigate the efficacy of a locally sustained-release vancomycin-eluting poly-L-lactide-co-caprolactone (PLCA) sheet in preventing MRSA vascular graft infections.
  • To evaluate the impact of this localized treatment on bacterial load, sepsis development, and survival rates.

Main Methods:

  • Development of a PLCA sheet for sustained vancomycin release over two weeks.
  • Suturing of expanded polytetrafluoroethylene vascular graft patches onto murine aortas.
  • Inoculation of MRSA onto grafts, followed by treatment with no intervention, vancomycin solution, or vancomycin-PLCA sheet.
  • Post-treatment assessment of graft bacterial counts, blood cultures, and survival rates at 7 and 28 days.

Main Results:

  • The vancomycin-PLCA group exhibited significantly lower MRSA counts in grafts compared to control and vancomycin solution groups.
  • All blood cultures in the vancomycin-PLCA group were negative for infection, while others were positive.
  • Survival rates at 28 days were substantially higher in the vancomycin-PLCA group (83.3%) versus the control group (16.7%).

Conclusions:

  • Local sustained release of vancomycin via a PLCA sheet effectively reduces MRSA in infected vascular grafts.
  • This localized treatment prevents sepsis and significantly improves survival rates in a murine model.
  • The vancomycin-PLCA sheet represents a promising, less-invasive adjunctive therapy for preventing prosthetic MRSA graft infections.

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