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Related Experiment Videos

Optimal method for culturing vascular prosthetic grafts.

F T Padberg1, S M Smith, R H Eng

  • 1Surgical Service, Veterans Administration Medical Center, East Orange, New Jersey 07019.

The Journal of Surgical Research
|October 11, 1992
PubMed
Summary

Ultrasonic bath treatment is the optimal method for detecting bacteria in vascular prostheses. This enhanced technique improves bacterial recovery from Dacron grafts, aiding in the diagnosis of prosthetic graft infections.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Biomedical Engineering

Background:

  • Vascular prosthetic infections are often underdiagnosed with standard culture methods.
  • Improved microbiologic techniques are needed to enhance bacterial detection in prosthetic graft specimens.
  • Accurate bacterial identification can significantly alter clinical management decisions.

Purpose of the Study:

  • To compare three methods for enhancing bacterial recovery from Dacron vascular prostheses.
  • To identify the optimal method for preparing prosthetic graft specimens for quantitative bacterial culture.
  • To evaluate the impact of different preparation techniques on bacterial viability and recovery.

Main Methods:

  • Quantitative culture techniques were used to assess bacterial recovery.

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  • Three methods were compared: ultrasonic bath treatment, direct ultrasonic disruption, and Vortex mixing.
  • Dacron graft cylinders were seeded with common bacterial pathogens.

    • Main Results:

    • Ultrasonic bath treatment yielded bacterial colony counts consistently 1 log higher than other methods.
    • Direct ultrasonic disruption at high energy levels reduced viable Gram-negative bacteria by up to 4 logs.
    • Vortex mixing produced the lowest bacterial counts among the tested methods.

    Conclusions:

    • A 5-minute ultrasonic bath treatment is the optimal method for preparing vascular prostheses for bacterial culture.
    • This method enhances bacterial recovery, potentially improving the diagnosis of vascular prosthetic infections.
    • Careful selection of microbiologic preparation techniques is crucial for accurate pathogen detection.