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- W2024454868 abstract "Infection remains the major cause of morbidity and mortality in burn patients. Furthermore, the use of antibiotics in such patients has led to the prevalence of antibiotic-resistant microbial infections; one such infection in intensive care unit turns out to be caused by the enterococcal organisms. Our laboratory studies have used a rat model of bum injury and Enterococcus faecalis infection. Sprague-Dawley male rats (∼250 g) were initially given an intragastric gavage of the antibiotic ciprofloxacin for 3 days. This procedure allowed for decontamination of intestine of gram-negative and some gram-positive organisms. The remainders of the gram-positive organisms were, to a large extent, Enterococci. After the decontamination procedure, rats were intra-abdominally inoculated with E. faecalis; inoculation involved preparation of sterilized rat fecal pellets impregnated with E. faecalis (104 colony-forming units) and their implants through a midline abdominal wall incision. Some of the rats that were implanted with the fecal pellets were subject to full-thickness skin bums (∼30% total body surface area; 95°C water for 7 s). Sham abdominal infection rats received a sterile pellet only; sham bum procedure consisted of exposing the skin to room temperature water. All sham and bum and/or E. faecalis infection procedures were carried out on rats under pentobarbital anesthesia. Inflammation and innate host defense-related responses were assessed via measurements of neutrophil effector responses, i.e., oxygen anion free radical (O2−)/eIastase production, CD11b/CD18 expression, apoptosis, and tissue infiltration. Determining epithelial lactulose permeability, microvascular albumin leakage, and epithelial tight junction integrity assessed the status of intestinal function/structural derangements. The animals' metabolic and cardiovascular integrity was evaluated determining blood pH, p02, pC02, heart rate, respiratory rate, blood pressure, and cardiac output. Whereas the aforementioned measurements were carried out at 24 to 48 h postbum injury with and without the Enterococcal infection, animal mortality was determined for up to 5 days after the experimental injuries. The results of the studies indicated that whereas bum or E. faecalis infection alone did not produce significant mortality, the dual insult with bum and E. faecalis infection resulted in significant animal death accompanied by relatively more profound metabolic and cardiovascular derangements. Inappropriately heightened neutrophil effector responses were present with bum alone as well as with the dual bum and infection complications. These studies suggest that animal models of bum injury with Enterococcal infection complications simulate the adverse outcomes bum patients infected with Enterococcal organisms." @default.
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- W2024454868 date "2005-12-01" @default.
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- W2024454868 title "INFLAMMATORY/CARDIOVASCULAR-METABOLIC RESPONSES IN A RAT MODEL OF BURN INJURY WITH SUPERIMPOSED INFECTION" @default.
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