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Catheter-Related Bloodstream Infection

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Catheter-Related Bloodstream Infection

Key Points

  • Central line-associated bloodstream infection (CLABSI) results from microorganisms entering the bloodstream via a central venous access device (CVAD) hub, dressing site, or lumen.
  • Prevention centers on a maintenance bundle: sterile dressing changes, hub decontamination, flushing and locking, and daily necessity assessment.
  • The preferred skin disinfectant for CVAD site care is 2% chlorhexidine for clients older than 2 months of age.
  • Transparent semipermeable membrane (TSM) dressings are changed at a minimum of every 7 days; gauze dressings at least every 48 hours.
  • Needleless-connector and tubing replacement intervals should follow policy-defined minimum-frequency standards, with shorter intervals for selected high-risk infusates.
  • Sutureless securement and CHG-impregnated insertion-site coverings can reduce microbial risk when used appropriately.
  • Nurses advocate for prompt catheter removal when the CVAD is no longer clinically indicated.

Pathophysiology

CLABSI occurs when microorganisms colonize the CVAD hub, catheter surface, or surrounding skin and migrate into the bloodstream. A typical surveillance definition requires bloodstream pathogens without another clear source in a client whose central line has been in place for more than two calendar days. The infection pathway begins with microbial accumulation at CVAD hubs or skin around the insertion site. When the integrity of the dressing or hub is compromised — by moisture, drainage, loosening, or improper technique — bacteria gain access to the bloodstream. The most common causative organisms are coagulase-negative staphylococci, Staphylococcus aureus, and Candida species.

Classification by Entry Point

  • Extraluminal (external) contamination: Microorganisms from skin flora migrate along the external surface of the catheter.
  • Intraluminal (hub) contamination: Microorganisms enter through the catheter hub or needleless connector during access.
  • Hematogenous seeding: Distant infection site seeds the catheter (less common).

Nursing Assessment

NCLEX Focus

Suspect CLABSI when a client with a CVAD develops unexplained fever, chills, or hemodynamic instability without another identified infection source — escalate promptly.

  • Assess CVAD insertion site and surrounding area every shift: inspect dressing integrity, site redness, swelling, warmth, tenderness, or drainage.
  • Monitor for systemic signs of bloodstream infection: fever (temperature ≥38.3°C / 101°F), chills, rigors, tachycardia, hypotension, or altered mental status.
  • For PICC lines, measure arm circumference each shift and compare to baseline — increasing circumference suggests deep vein thrombosis.
  • Assess catheter external length at each shift and compare to documented insertion length to detect catheter migration.
  • Review the clinical necessity of the CVAD daily; document findings according to agency policy.

Nursing Interventions

Prevention bundle (core CLABSI maintenance practices):

  • Perform hand hygiene before all CVAD access or dressing manipulation.
  • Change TSM dressings at a minimum of every 7 days or immediately if moist, loose, soiled, or if site appears infected; change gauze dressings at least every 48 hours.
  • Use aseptic technique during dressing changes: sterile gloves, mask, and chlorhexidine skin antisepsis (at least 0.5%, commonly 2%) with about 30 seconds of friction and complete dry time before new dressing application.
  • Follow ANTT principles during dressing changes/access (protect key parts and key sites, and use a controlled aseptic field).
  • Use engineered stabilization to prevent catheter pistoning/dislodgement; when clinically appropriate, sutureless securement can reduce additional skin-puncture infection risk.
  • Use chlorhexidine-impregnated gel/biopatch at the insertion site when indicated by policy, and use temporary sterile gauze if early post-insertion bleeding/exudate is present until leakage resolves.
  • If chlorhexidine cannot be used because of allergy/sensitivity, use an approved alternative antiseptic (for example povidone-iodine) per policy.
  • Decontaminate catheter hubs and needleless connectors with a chlorhexidine-alcohol or 70% alcohol scrub for at least 15 seconds (minimum) up to 60 seconds using friction in a twisting motion.
  • Change needleless connectors no more frequently than every 72 hours unless policy or clinical indication requires earlier replacement.
  • Replace continuously used tubing (including secondary sets) no more frequently than every 96 hours but at least every 7 days; use shorter replacement intervals for TPN, blood products, chemotherapy, and propofol per policy.
  • Flush CVADs with 0.9% sodium chloride to maintain patency; apply a locking solution when not in use to prevent intraluminal clot formation and catheter colonization.
  • Label dressings with date, time, and initials at each change.

When infection is suspected:

  • Notify the provider immediately; anticipate orders for blood cultures (peripheral and through the CVAD).
  • Monitor vital signs continuously and prepare for sepsis management protocol.
  • Anticipate catheter removal if CLABSI is confirmed, unless no alternative access exists.
  • If removal occurs, anticipate culture of the catheter tip per policy and coordinate organism-directed antibiotic therapy and interdisciplinary case review for contributing factors.

Escalation Threshold

New fever or hemodynamic instability in a client with a CVAD must be evaluated for CLABSI. Delay in recognition and treatment can progress to septic shock. Advocate for catheter removal as soon as it is no longer clinically necessary.

Self-Check

  1. What are the three main routes by which microorganisms enter the bloodstream via a CVAD?
  2. Which skin disinfectant is preferred for CVAD dressing changes, and what is the minimum scrub time for hub decontamination?
  3. What clinical findings should prompt the nurse to suspect CLABSI in a client with a central line?

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