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Evaluation of antimicrobial agents in the rabbit model of endocarditis
Abstract:
The placement of a sterile polyethylene catheter in the heart of a rabbit results in nonbacterial thrombotic endocarditis characterized by an accumulation of fibrin strands, erythrocytes, and platelets that adhere to the endothelial surface. These elements form a nidus where a pathogen, when introduced by injection, lodges, multiples, and develops vegetations typical of infective endocarditis. In the rabbit model, endocarditis induced by Staphylococcus aureus or viridans group Streptococcus resembles the human disease in clinical and bacteriologic features and in response to antimicrobial therapy. The rabbit model thus affords a means of evaluating the therapy of endocarditis. The end points of therapeutic response are culture-negative vegetations and failure to relapse. On the basis of these criteria vancomycin was found to be more rapidly effective in curing an infection caused by a single strain of S. aureus than penicillin or cefazolin and as effective as a combination of penicillin and gentamicin.
Insights
A rabbit model of infective endocarditis was developed using catheter placement and bacterial injection. Vancomycin demonstrated faster efficacy against Staphylococcus aureus endocarditis compared to other antibiotics.
Area of Science:
- Infectious Diseases
- Cardiology
- Microbiology
Background:
- Nonbacterial thrombotic endocarditis (NBTE) is characterized by fibrin, erythrocytes, and platelets on the heart's endothelial surface.
- NBTE serves as a nidus for bacterial proliferation, leading to infective endocarditis (IE).
Purpose of the Study:
- To establish and validate a rabbit model for evaluating infective endocarditis therapies.
- To compare the efficacy of vancomycin against Staphylococcus aureus-induced IE.
Main Methods:
- Induction of NBTE in rabbits via sterile polyethylene catheter placement.
- Introduction of Staphylococcus aureus or viridans group Streptococcus to establish IE.
- Therapeutic evaluation based on culture-negative vegetations and relapse rates.
Main Results:
- The rabbit model accurately mimics human IE in clinical and bacteriologic features.
- Vancomycin showed more rapid efficacy in curing S. aureus IE than penicillin or cefazolin.
- Vancomycin was as effective as penicillin plus gentamicin for S. aureus IE.
Conclusions:
- The rabbit model is a valuable tool for assessing endocarditis treatment efficacy.
- Vancomycin is a highly effective therapeutic option for Staphylococcus aureus infective endocarditis.