Although central venous catheters (CVCs) are indispensable in critical care, they’re linked to serious infections that can lead to illness and death. CVC insertion disrupts skin integrity, greatly raising the patient’s risk of infection by bacteria, fungi, or both. Catheter-related bloodstream infections (CR-BSIs) can result in hemodynamic changes and organ dysfunction associated with severe sepsis and death.
Almost half of intensive care unit (ICU) patients have CVCs, accounting for 15 million central catheter days annually. In the United States, CR-BSIs have a mortality of approximately 18% and are linked to a mean excess cost of $18,432 and a mean excess length of stay of 12 days.
Increasing evidence shows that specific best practices can help achieve the goal of preventing CR-BSIs. A Joint Commission national patient safety goal required hospitals to fully implement evidence-based practice guidelines to prevent CR-BSIs by January 1, 2010. This article describes evidence-based nursing practices that aid CR-BSI prevention and discusses strategies that promote the nursing practice changes needed to prevent these infections and optimize care for patients with CVCs.
Risk factors for infection
ICU patients have a greater risk of CR-BSIs because:
- their underlying illness makes them more susceptible to infection
- their treatment commonly involves invasive devices that disrupt skin integrity, antibiotics that raise the risk of bacterial resistance, and steroids that compromise the immune system
- they are likely to undergo surgery, transplantation, or dialysis or to receive chemotherapy or radiation therapy.
Age is an important risk factor, too. Premature infants and patients older than age 65 are the most vulnerable to these infections.
Evidence-based practices to prevent CR-BSIs
Scientific evidence—particularly the results of randomized, controlled trials—provides a solid foundation to identify the nursing care activities that help prevent CR-BSIs. The evidence also helps identify practices that may add nothing and should be discontinued.
Care “bundles” are groupings of best practices that pertain to a specific disease process. The Institute for Healthcare Improvement is one source for these bundles. Implementing all practices in the bundle together results in better outcomes than using the practices individually. The evidence supporting the bundle components is adequately established to be deemed a standard of care.
One proposed central-line care bundle is based on a protocol used at Rady Children’s Hospital in San Diego. Proven effective in preventing CR-BSIs, it includes the following components:
- Hand hygiene. For healthcare workers caring for a patient with an intravascular line, rigorous hand hygiene is critically important to remove transient hand flora that may have been picked up from other patients or environmental surfaces.
- Maximal barrier precautions during insertion. During central line placement, the patient should be covered with a sterile drape from head to toe, with a small fenestration at the insertion site. The operator must wear a cap, mask, sterile gown, and sterile gloves.
- Chlorhexidine skin antisepsis. Evidence shows chlorhexidine is more effective than povidone-iodine or alcohol in reducing skin flora around the insertion site and has a residual effect not seen with povidone-iodine or
- Optimal catheter-site selection with femoral-vein avoidance in adults. Although many intensivists and anesthesiologists prefer the internal jugular site for easier insertion, evidence suggests that lines placed using the subclavian vein have the lowest infection risk.
- Daily review of line necessity, with prompt removal of unnecessary lines. Every day a catheter stays in place, a risk exists that infectious organisms may gain entry through the insertion site or by line manipulation. Every day, assess patients with CVCs for necessity of the line; unnecessary lines should be removed as soon as possible.
Best nursing practices
The following nursing practices help prevent CR-BSIs.
Sterilizing needlefree catheter hubs
- All-inclusive catheter cart or kit. Use an all-inclusive cart or kit that keeps the necessary supplies for CVC insertion together in one place.
- Hand hygiene. Conscientiously perform thorough hand hygiene before and after patient care.
- Site care. Besides using chlorhexidine for skin preparation before catheter insertion, use a well-adhered transparent dressing, which can stay in place for 7 days.
- I.V. site maintenance. Evaluate the necessity of the central line daily, and check the site for redness and drainage. Keep the dressing dry and intact at all times. Change a transparent dressing every 7 days and a gauze dressing every 48 hours unless it’s compromised. If the dressing doesn’t stay occlusive or becomes damp or soiled, change it as soon as possible.
- Line access. A recent pediatric ICU study found that a CVC in a critically ill child was accessed an average of 16 times per shift; in extreme cases, it was entered up to 80 times. Reducing the number of entries into and connections for an intravascular line decreases the infection risk. Be sure to disinfect the catheter hub before you enter the line—every time.
- Appropriate staffing and nursing workloads. Understaffing and increased nursing workloads can increase the CR-BSI risk.
Centers for Disease Control and Prevention (CDC) guidelines for CR-BSI prevention don’t clearly indicate which agent to use or the time frame required for disinfecting the catheter hub. The conventional practice is to disinfect a needleless I.V. catheter connector hub by swabbing it vigorously for 3 to 5 seconds with 70% alcohol. However, one study showed this doesn’t reliably prevent organisms from entering the line.
To help clarify the best practice, Kaler and colleagues conducted a study at Rady Children’s Hospital to determine the required duration and disinfectant to use when “scrubbing the hub.” The study compared the efficacy of 70% alcohol alone to that of 3.15% chlorhexidine/70% alcohol used for 15 seconds. Investigators also sought to determine whether the design of a mechanical valve hinders its ability to be properly disinfected. A total of 300 mechanical valves of four different types were inoculated with a 105 colony-forming unit (CFU) suspension of the organisms most commonly seen in clinical practice (Staphylococcus aureus, Staphylococcus epidermidis, Pseudomonas aeruginosa, and Candida albicans). All valves were flushed with 0.5 mL saline solution; the flush was collected onto blood agar plates that were incubated for 48 hours to promote bacterial growth.
The inoculated access ports that hadn’t been disinfected grew 103 organisms. No microorganisms were recovered from any port that had been disinfected for 15 seconds with alcohol alone or chlorhexidine/
alcohol. Investigators concluded that scrubbing a catheter access port for 15 seconds with friction using either alcohol or chlorhexidine/alcohol was effective in sterilizing mechanical valve ports inoculated with a 105-CFU suspension of microorganisms. Results were the same whether the valve was made with positive, negative, or neutral displacement technologies.
Improving compliance with evidence-based practices
Although numerous studies show that evidence-based practices help prevent CR-BSIs, these practices aren’t being translated to the bedside to the extent required. (See Poor compliance with evidence-based CVC practices by clicking on the PDF icon above.) Human-factors research indicates that consistent compliance with guidelines may be viewed both as a systems property of ICUs and the result of individual clinicians’ decisions and habits. The work system of an ICU includes not only the unit’s physical layout but its culture, as beliefs and attitudes affect care providers’ behavioral patterns.
To improve compliance with evidence-based practices, both facility and provider issues must be addressed, as in the three-step “dress rehearsal” approach described next. It can be used to flag both potential problems with proposed procedures and problems with procedures already in use. In this rehearsal, ICU team members mentally map and physically walk through a proposed or existing protocol to identify and mitigate concerns, such as supply availability and compatibility with existing workflow patterns.
Resolving system issues
- Walk the process. Walking through a new process before implementation may reveal problems. In one facility, for instance, one of the goals of physician rounds was to evaluate the need for existing vascular lines. But clinicians on rounds couldn’t readily identify which lines a patient had in place. To remedy the situation, nursing staff now detail the lines on a whiteboard that can easily be seen during rounds.
- Observe a clinician. In this step, the team observes a clinician performing a new protocol in order to flag potential failure modes. For example, a clinician might note that the supplies needed to perform the central line insertion bundle are spread out over eight different places in the unit. A solution is to centralize supplies in line-insertion kits or on a cart.
- Learn the context. When clinicians express opposition to policies, feedback should be solicited to help determine the root cause of the anticipated noncompliance. For example, a nurse might resist having to scrub a connector hub for more than 3 to 5 seconds. Highlighting the evidence in published literature can help the nurse understand why adhering with the prescribed duration is important. (To meet the time requirement, sing the “Happy Birthday” song twice while scrubbing.)
The facility, unit, or other system may pose barriers to compliance, such as ambiguity. One group of researchers conducted in-depth interviews and observations of 20 healthcare providers in two surgical ICUs. They found a fair amount of system ambiguity that could explain noncompliance with guidelines aimed at CR-BSI prevention. The research team identified two basic types of ambiguity.
- Expectation ambiguity results when clinicians aren’t clear on what’s expected of them. For example, when nurses in one ICU received data on the CR-BSI rate, they didn’t know what to do with it. Told that infection rates were “4.6/1,000 line days,” they didn’t perceive this data as directly relevant to bedside practice. The solution was to report the raw number of CR-BSIs in as close to real time as possible, so infection could be discussed during rounds while the patient was still in the bed.
- Exception ambiguity can occur because it’s not always possible to be 100% prescriptive in describing a best practice or developing a protocol. Inserting a CVC in a subclavian vein isn’t possible in some patients; also, chlorhexidine is contraindicated in children younger than 2 months. Highlighting potential issues such as these on the insertion checklist can reduce exception ambiguity. If clinicians can’t use a particular practice, they can document the exception.
Resolving care-provider issues: A case in point
In 1998, the CR-BSI rate in the surgical/burn/trauma ICU at Barnes-Jewish Hospital in St. Louis, Missouri was almost double the average rate documented in the National Nosocomial Infections Surveillance database. Infection control specialists determined that nurses weren’t being educated on how to care for central lines or on how CR-BSIs occur. To improve their performance, a thorough education module was implemented; subsequently, the infection rate on that unit fell 66%. (See Barnes-Jewish Hospital’s education module by clicking on the PDF icon above.)
Seeing the success of the educational intervention, physicians and nurses in the unit wanted to drive the CR-BSI rate even lower. A multidisciplinary team used the Plan-Do-Study-Act method to develop pictorials—a series of photographs showing each key step in the procedure. Laminated sets of central-line insertion pictorials were placed in resident manuals and on procedure carts. The team also mapped and photographed the process for changing a central-line dressing and created pictorials to be placed in each patient’s room. Physicians and nursing staff found these reminders helpful.
“Scrub the hub” targeted education
In 2006, Missouri Baptist Medical Center saw an upward trend in its CR-BSI rate. The facility had implemented the education module described above more than a year earlier. After implementation, one ICU went 212 days without a CR-BSI; then a patient developed a CR-BSI. Close observation of nursing practice found nurses weren’t scrubbing the catheter hub before injecting medications or antibiotics into the line.
To improve compliance, a highly focused intervention was implemented. Eye-catching posters reminding clinicians to “scrub the hub” were made into computer screensavers and posted throughout the hospital. A “scrub the hub” maintenance bundle was implemented, and nurses were educated on the required practices. Although some questioned the need to scrub for 30 seconds, that duration was kept in the protocol in the hope it would prompt busy ICU nurses to scrub for at least 15 seconds. (See “Scrub the hub” maintenance bundle by clicking on the PDF icon above.) Since implementation of the “scrub the hub” initiative, the ICU has gone more than 18 months without a CR-BSI. The initiative is now part of the ICU nurses’ daily line-care routine.
Key factors for success
In the examples above, several factors helped ensure the success of the initiatives designed to prevent CR-BSIs.
Nurses held themselves and others accountable for identifying, implementing, and ensuring compliance with evidence-based practices.
- The initiatives got 100% support from hospital administrators, physicians, and nursing staff.
- Educational efforts included mandatory education, annual educational module testing, and a requirement that all new ICU nurses complete the education module.
- Reminders included laminated pictorials placed in resident manuals and patient rooms and on procedure carts.
- Staff received feedback. For instance, they were informed of infection rates in as close to real time as possible.
- Infection prevention and control staff performed rounds and worked with nurses and physicians.
- Current and potential problems were flagged by nursing, medical, and infection prevention and control staff.
Reducing infections: Possible and imperative
Published reports and clinical experience show CR-BSIs can—and should—be substantially reduced or even eliminated. Nurses can help achieve this goal by promoting a culture of zero tolerance for noncompliance with proven measures for CR-BSI prevention. Both system issues and staff behavioral patterns should be addressed through recurring education, reminders, competency assessment, use of physician and nursing champions, sharing of published data, and ongoing feedback to staff. By implementing and complying with evidence-based nursing practices, nurses can play a vital role in preventing CR-BSIs.
Coopersmith CM, Rebmann TL, Zack JE, et al. Effect of an education program on decreasing catheter-related bloodstream infections in the surgical intensive care unit. Crit Care Med. 2002;30(1):59-64.
Coopersmith C, Zack J, Ward M. The impact of bedside behavior on catheter-related bacteremia in the intensive care unit. Arch Surg. 2004;(139). http://archsurg.ama-assn.org/cgi/content/full/139/2/131. Accessed November 25, 2009.
Kaler W, Chinn R. Successful disinfection of needleless mechanical valve access ports: a matter of time and friction. www.avainfo.org/website/download.asp?id=205560. Accessed November 25, 2009.
O’Grady NP, Alexander M, Dellinger EP, et al. Guidelines for the prevention of intravascular catheter-related infections. Centers for Disease Control and Prevention. MMWR Recomm Rep. 2002;51(RR-10):1-29.
Warren DK, Yokoe DS, Climo MW, et al. Preventing catheter-associated bloodstream infections: a survey of policies and care of CVC from hospitals in the prevention epicenter program. Infect Control Hosp Epidemiol. 2006;27:8-13.
Zack J. Zeroing in on zero tolerance for central line-associated bacteremia. Am J Infect Control. 2008;36(10):S176e1-S176e2.
Carol Hatler is Director of Nursing Research at St. Joseph’s Hospital and Medical Center in Phoenix, Arizona. Joan Hebden is Director of Infection Control at the University of Maryland Medical Center in Baltimore. Wendy Kaler is Manager of Infection Control at St. Francis Memorial Hospital in San Francisco, California. Jeanne Zack is Infection Prevention and Control Manager at Missouri Baptist Medical Center in St. Louis. The authors of this CNE activity have disclosed that they are paid speakers for CareFusion Corp. (formerly Cardinal Health).
A peer review of the activity was carried out for freedom from bias due to conflict of interest. The planners of this CNE activity have disclosed no relevant financial relationships with any commercial companies pertaining to this activity.