Abstract
Infections related to intravascular catheters are a major complication of critical care. Central venous catheters (CVCs) and other intravascular catheters are needed for intensive patient care, but are associated with an increased burden of infection, mortality and length of stay. The main proposed mechanism of catheter-related infections is migration of skin organisms from the insertion site into the cutaneous catheter tract with colonization of the catheter tip. Colonization is extraluminal initially and is common with non-tunneled, non-cuffed short-term central venous catheters. With longer durations of catheterization, i.e. after 1–2 weeks, intraluminal colonization develops. Bloodstream infections (BSIs) originate both from extraluminal and intraluminal catheter colonization [1]. Within the catheter lumen bacteria are relatively “protected” from host defense mechanisms and antimicrobial agents by a biofilm layer [2]. This biofilm matrix is produced by bacteria and consists of an extracellular polymeric substance (exopolysaccharide), enriched by divalent metallic cations, such as calcium, magnesium and iron. Candida spp. can produce a similar slime in the presence of dextrose-containing fluids.
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Humphreys, H., Winter, B., Paul, M. (2013). Cardiovascular Infections. In: Infections in the Adult Intensive Care Unit. Springer, London. https://doi.org/10.1007/978-1-4471-4318-5_7
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DOI: https://doi.org/10.1007/978-1-4471-4318-5_7
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