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The pathogenesis and prevention of central venous catheter-related infections
1Department of Medical Specialties, University of Texas M.D. Anderson Cancer Center, Houston 77030.
Abstract:
Vascular catheters are a major source of nosocomial infections. Definite diagnosis of catheter-related infections should include the use of quantitative catheter cultures or differential quantitative blood cultures. The skin and catheter hub are the two major sources for the introduction of the colonizing organisms. Both microbial (slime) and host (fibrin and fibrinectin) factors contribute to the formation of the biofilm which is essential for the adherence and maintenance of the colonization. Staphylococci and Candida are the leading causative agents. Prolonged duration of catheterization, thrombogenic catheter material, frequent manipulation of the catheter, improper aseptic insertion and maintenance techniques, tranparent plastic dressings, contaminated skin solutions, location of the catheter, and possibly multilumen central venous catheters (CVC) are risk factors predisposing to infections. Preventive measures include a skilled infusion therapy team, topical disinfectants such as chlorhexidine and topical antibiotics, silver impregnated cuffs (for short term CVC), coating catheters with antiseptic agents and maximal barrier precautions during insertion. Exchanging central venous catheters over a guidewire might be useful diagnostically but have not been proven to be of any therapeutic or preventive potential.
Insights
Vascular catheter infections are common, often caused by skin bacteria forming biofilms. Diagnosis requires quantitative cultures, and prevention involves aseptic techniques and antiseptic agents.
Area of Science:
- Infectious Diseases
- Medical Microbiology
- Infection Prevention
Background:
- Vascular catheters are a significant source of nosocomial infections.
- Biofilm formation, involving microbial and host factors, is crucial for catheter colonization.
- Staphylococci and Candida are primary causative agents of catheter-related infections.
Purpose of the Study:
- To review the sources, pathogenesis, risk factors, and prevention strategies for vascular catheter-related infections.
- To highlight diagnostic methods for definitive diagnosis of catheter-related infections.
Main Methods:
- Literature review of studies on vascular catheter infections.
- Analysis of factors contributing to biofilm formation and microbial adherence.
- Evaluation of various preventive measures and diagnostic techniques.
Main Results:
- Skin and catheter hub are key entry points for colonizing organisms.
- Prolonged use, manipulation, and improper techniques increase infection risk.
- Effective prevention includes skilled teams, aseptic practices, and antiseptic/antibiotic interventions.
Conclusions:
- Quantitative cultures are essential for diagnosing catheter-related infections.
- Comprehensive preventive strategies are crucial to reduce infection rates.
- Exchanging catheters over guidewires has diagnostic but not proven therapeutic value.