A nurse is caring for a client with a newly inserted indwelling urinary catheter. Which nursing intervention is the priority to prevent catheter-associated urinary tract infection (CAUTI)?
1Maintain a closed drainage system and keep the drainage bag below the level of the bladder✓ 정답
2Change the catheter every 7 days to prevent bacterial colonization
3Irrigate the catheter with normal saline every 8 hours to maintain patency
4Apply antibiotic ointment to the catheter insertion site twice daily
해설
Maintaining a closed drainage system and keeping the bag below bladder level prevents backflow and bacterial contamination, which is the priority for CAUTI prevention. Other options like routine catheter changes or irrigation are not recommended as they can increase infection risk.
The priority nursing intervention to prevent CAUTI in a client with a newly inserted indwelling urinary catheter is to maintain a closed drainage system and keep the drainage bag below the level of the bladder. This practice is foundational because it directly addresses the most common pathogenic pathway for infection: the introduction of bacteria into the sterile urinary tract via the catheter lumen. A closed system prevents ascending microorganisms from gaining entry at the junction between the catheter and the drainage tube, a critical point of vulnerability . Keeping the drainage bag below the bladder level utilizes gravity to prevent the backflow of contaminated urine from the bag into the bladder, which would otherwise introduce a large bacterial inoculum directly to a susceptible site [3].
The other options represent either outdated, unnecessary, or potentially harmful practices that are not supported by current best evidence. Routine catheter changes at fixed intervals, such as every 7 days, are not recommended. The duration of catheterization is a significant, independent risk factor for CAUTI, but the solution is daily assessment of continued need and prompt removal, not prophylactic replacement [3]. Unnecessary changes break the closed system and introduce new opportunities for bacterial contamination during the reinsertion process. Similarly, routine irrigation with normal saline is contraindicated as a preventive measure. Irrigation disrupts the closed system and can push bacteria from the distal urethra or catheter lumen up into the bladder, increasing infection risk . It should only be performed for specific therapeutic reasons, such as to relieve an obstruction, not for routine maintenance. Finally, applying antibiotic ointment to the insertion site is not a standard, evidence-based CAUTI prevention strategy. The primary source of bacteria is often the client's own perineal flora migrating intraluminally, making topical ointment at the urethral meatus ineffective for preventing most infections . Standard daily meatal cleansing with soap and water is sufficient.
A systematic review confirms that multifaceted strategies are most effective, with maintaining a sterile, continuously closed drainage system being a cornerstone intervention with the strongest evidence [3]. A consensus guideline further emphasizes that ensuring unobstructed urine flow and preventing reflux are critical technical components of care, directly linked to the principle of keeping the bag below the bladder . A risk assessment study identified prolonged catheterization and breaks in the closed system as key modifiable risk factors, reinforcing that the priority is to preserve the integrity of the system from insertion to removal . The best evidence summary also highlights that the closed drainage system should only be breached for clinically necessary reasons, such as obtaining a sterile urine sample from the designated sampling port using aseptic technique .
References (research sources)
[3]
Effective interventions to prevent catheter-associated urinary tract infections: a systematic review.Meta-analysis/systematic reviewLi N, Shi R, Sun Y, Chen Q. (2025) · DOI: 10.1590/s1678-9946202567061
Clinical Practice Guide: CAUTI Prevention
The cornerstone of CAUTI prevention is maintaining a sterile, continuously closed drainage system. Any breach of this system, such as disconnecting the catheter from the drainage tube or opening the sampling port unnecessarily, provides a direct pathway for bacterial entry. The drainage bag must always be positioned below the level of the bladder and off the floor to prevent urine backflow and contamination. Empty the collection bag regularly using a separate, clean container for each patient, and ensure the drainage spigot never touches the non-sterile container.
Key Nursing Actions
Perform hand hygiene and use gloves before any manipulation of the catheter or drainage system.
Secure the catheter to the patient's thigh or abdomen to prevent movement, traction, and urethral injury.
Perform routine daily meatal hygiene with soap and water; avoid antiseptic or antibiotic ointments unless specifically ordered.
Assess the need for continued catheterization daily and remove the catheter as soon as clinically indicated.
Maintain unobstructed urine flow; ensure the catheter and tubing are free of kinks and dependent loops.
Practices to Avoid
Routine catheter irrigation, unless prescribed to relieve an obstruction.
Scheduled catheter changes at arbitrary intervals; change only when clinically indicated (e.g., infection, obstruction) or per manufacturer guidelines.
Routine instillation of antiseptic or antimicrobial solutions into the drainage bag.
Obtaining urine cultures from asymptomatic patients solely due to catheter presence.
Documentation and Monitoring
Document the date and time of catheter insertion, indication for use, and ongoing assessments. Monitor for signs and symptoms of CAUTI, including fever, suprapubic tenderness, acute hematuria, and altered mental status in older adults. If infection is suspected, obtain a urine specimen aseptically from the needleless sampling port, never from the drainage bag.
CAUTI — Catheter-Associated Urinary Tract Infection; an infection occurring in a person whose urinary tract is currently catheterized or has been catheterized within the previous 48 hours.
Closed drainage system — A sterile, sealed system where the catheter and collection bag are connected without any breaks, preventing the entry of microorganisms into the urinary tract.
Indwelling urinary catheter — A flexible tube inserted through the urethra into the bladder to continuously drain urine, commonly known as a Foley catheter.
Ascending infection — The most common route of infection in CAUTI, where bacteria migrate upward through the catheter lumen or along the outside of the catheter into the bladder.