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Porcine model for vascular graft studies
R J Mehran1, M A Ricci, A M Graham
1Department of Surgery, Royal Victoria Hospital, McGill University, Montréal, Canada.
Summary
A new swine model offers a reproducible and cost-effective method for studying prosthetic vascular graft infections. This model closely mimics human physiology, making it a valuable alternative to traditional animal models for research.
Area of Science:
- Veterinary Medicine
- Surgical Innovation
- Biomedical Research
Background:
- Prosthetic vascular graft infections pose significant clinical challenges.
- Existing animal models (dog, rabbit) have limitations in mimicking human physiology.
- A need exists for a more relevant and practical animal model for infection studies.
Purpose of the Study:
- To develop and validate a reproducible swine model for studying prosthetic vascular graft infections.
- To compare the physiological relevance of the swine model to human and other animal models.
- To assess the feasibility and safety of the swine model for research.
Main Methods:
- Infrarenal aortic replacement with prosthetic grafts in 156 farm-bred pigs.
- Induction of graft infection via direct inoculation or intravenous bacterial infusion (Staphylococcus aureus).
- Graft analysis using cultures, histology, and electron microscopy at 1-4 weeks post-surgery.
Main Results:
- The swine model demonstrated physiological similarities to humans in cardiovascular function and bacterial clearance.
- Anesthetic complications were low (2.5%), and postoperative mortality decreased with experience (11.5%).
- Wound infection was the primary cause of morbidity, while graft thrombosis and sepsis were significant causes of mortality.
Conclusions:
- The swine model is a viable and attractive alternative for studying prosthetic vascular graft infections.
- Its physiological relevance, cost-effectiveness, and availability support its use in research.
- Further investigation into operative techniques and comparative analysis is warranted.