TY - JOUR AU - Huskins, W, Charles AB - Central venous catheters (CVCs), including nontunneled CVCs, peripherally inserted central catheters (PICCs), and tunneled or implanted central access devices, are commonly used in pediatrics for emergent, short-term, and long-term indications. CVCs may be associated with insertion-related, mechanical, thrombotic, and infection-related complications that, in turn, are associated with higher mobidiity and mortality, and increased healthcare costs [1–6]. These complications may be competing risks because the choice of CVC insertion site affects the risk of thrombotic and infection-related complications differently [7]. These complications are also additive. For example, CVC-associated thrombi increase the risk of infection because biofilms of fibrin, plasma proteins, and cellular elements allow microbes to colonize the catheter more easily [1, 3]. For these reasons, CVC safety must be viewed holistically, with multidisciplinary input and collaboration. It is essential that all clinicians, including infectious diseases physicians, consider the collective adverse events associated with the use CVCs, both infection-related and non infection-related, as they approach use of a CVC in an individual patient. Central Venous Catheter Selection, Insertion Site Choice, and Insertion Procedures CVCs enable emergent resuscitation, urgent administration of lifesaving medications and fluids, and renal replacement during critical illness. They also offer stable long-term access for essential intravenous therapies. Selection of CVC type is typically guided by indications for central access, the integrity of potential access sites, and available resources, including both personnel and equipment. Quickly accessed nontunneled CVC cannulation sites for emergent and urgent indications include the subclavian vein, internal jugular vein, femoral vein, and the umbilical vein (in neonates) [1]. Insertion at these “short-term” CVC sites requires few steps, such as ultrasound assessment, needle insertion, wire deployment, dilation, and catheter placement [7]. Comparisons of subclavian, jugular, and femoral CVC insertion sites in adults demonstrate pros and cons for each site [8, 9]. Complicating interpretation of these data is the fact that much of the evidence comparing insertion-related complications of nontunneled CVC insertion predates use of ultrasound during the insertion procedure. In our practice, we evaluate site risk and benefit for individual patients, taking into consideration both patient-related factors and individual clinician skill and comfort with placement technique. Subclavian CVCs may have a lower incidence of CVC-associated bloodstream infections (CLABSIs) in adults, and some studies have also found a lower rate of thrombosis [8, 10]. However, subclavian CVC placement is associated with up to a 2-fold risk of major insertion-related complications, including pneumothorax, hemorrhage, severe hematoma, and neurologic complications [8]. The internal jugular vein is much easier to visualize with ultrasound compared with the subclavian vein, so it is often favored [11]. In adults, there is some evidence that jugular CVCs may offer an advantage over femoral CVCs for avoiding infection, though data are inconsistent [1, 8, 10]. Compared with femoral CVCs, jugular CVCs have a higher rate of insertion-related complications (misplacement, pneumothorax, arterial dilation) and venous-to-arterial fistula, but femoral CVCs have a higher rate of overall thrombotic complications [8, 12]. The Infectious Diseases Society of America (IDSA) recommends avoiding femoral vein placement in adults [1]. However, in children, the evidence available to date does not support avoiding femoral CVCs compared with jugular CVCs [13, 14]. Although there is some evidence that femoral CVCs may have higher thrombotic risk (which must be weighed against jugular CVC’s higher rate of insertion complications), the anatomic site of CVC placement has not been demonstrated to be a risk factor for pediatric infection-related complications [13, 15–17]. Patients who require urgent but not emergent central venous access are candidates for PICCs. Infectious diseases physicians often play a larger role in PICC catheter selection and insertion because these catheters are used to treat infections that require extended parenteral antibiotic treatment. PICCs may be placed by trained providers at the bedside or in nonsurgical suites, such as interventional radiology. Insertion requires either a compliant patient or sedation. PICCs may be associated with a lower risk of infection compared with short-term CVCs in certain critically ill pediatric populations [18, 19]. However, pediatric data are inconsistent; some studies found that PICCs have a lower risk of infection, whereas others found no difference [15, 18, 20, 21]. Large adult population studies have not consistently shown use of PICCs to have a significant advantage in preventing infection-related complications or in reducing cumulative infection incidence [10, 22, 23]. There is also evidence that PICCs may have a higher risk of thrombotic complications compared with other CVCs, particularly when the catheter-to-vein diameter ratio exceeds 30%–45% [15, 24–26]. PICCs are often left in place longer than subclavian, jugular, or femoral CVCs. This may be why the cumulative incidence of infection has been demonstrated to be similar even if the per-day incidence is lower [20]. Longer duration of use also confounds assessment of their cumulative incidence of non infection-related complications because longer-dwelling catheters are at increased risk of biofilm development, fibrin accumulation, and other factors that increase the likelihood of thrombotic complications [1, 3, 27]. Tunneled or implanted CVCs (ports) are placed in children for a variety of long-term clinical indications such as chemotherapy, long-term parental nutrition, antimicrobial therapy for severe infections (eg, invasive fungal pneumonia, ganciclovir-resistant cytomegalovirus infection, hardware-associated infections if the hardware cannot yet be safely removed), dialysis, or laboratory blood draws in patients with difficult intravenous access. Tunneled CVCs and ports are typically placed in sterile settings, such as operating rooms or interventional radiology suites [7, 15]. These catheters are associated with lower infection and thrombotic risk [1, 10, 22, 28]. For longer-term central access indications, we preferentially use tunneled catheters or ports because of their lower infection and thrombotic risk. In general, placing smaller catheters with fewer lumens is associated with a lower risk of both thrombosis (smaller catheter diameter) and infection (fewer contamination opportunities) [25, 26, 29]. We emphasize choosing the smallest-diameter catheter with the fewest number of lumens possible. CVC insertion bundles have been shown to reduce the risk of infection-related complications. Bundles should include hand hygiene, antiseptic skin preparation, sterile barriers, utilization of a checklist and independent observer, and a CVC insertion cart or kit [1, 10, 30, 31]. Proceduralists should be trained specifically in CVC insertion [32]. Use of ultrasound guidance reduces the number of cannulation attempts and, therefore, insertion-related complications [1, 11, 33]. Reducing insertion-related complications reduces the development of local thrombi and inflammation, thereby reducing infection risk [1, 11, 33]. Routine catheter “re-siting” (moving the same type of catheter to a different site) or “re-wiring” (insertion of a new catheter via exchange over a wire) has not been demonstrated to reduce either thrombotic or infection-related complications. We do not recommend these practices [1]. Prevention of Catheter-Associated Infection-Related Complications Insertion site, tunnel-track, and implanted port-pocket infections are uncommon and usually reflect insertion-related contamination that may be exacerbated by local trauma [1, 7]. In contrast, CLABSIs are common and typically reflect the adequacy of CVC maintenance practices. We have summarized our major recommendations for longitudinal CLABSI prevention in Table 1. Common mechanisms for CLABSI include migration of skin organisms at the insertion site along the exterior surface of the CVC into the vein and direct contamination of the interior surface of the CVC during access [1, 34]. Rarely, infection may also occur by infusion of extrinsically or intrinsically contaminated medications, fluids, or blood products (platelets, plasma). In addition to CVC-associated fibrin and thrombosis, patient and care-related risk factors for CLABSI include cancer or other immunocompromised status, critical illness, cardiovascular disease, a history of CVC infection, longer duration of nontunneled CVC dwell time, gastrostomy tube presence, parenteral nutrition, and blood transfusions [1, 35–38]. We consider use of catheters impregnated with an antimicrobial (chlorhexidine/silver sulfadiazine or minocycline/rifampin) for pediatric patients at highest risk for CLABSI, for instance, in immunocompromised children who need emergent or urgent central lines during critical illness [37]. Table 1. Summary of Central Venous Catheter–Associated Bloodstream Infection Prevention Strategies Central Venous Catheter–Associated Bloodstream Infection Prevention Strategya . Level of Recommendation . CVC insertion bundle: hand hygiene, antiseptic skin preparation, sterile barriers, utilization of a checklist and independent observer, and a CVC insertion cart or kit Strongly recommended Catheter site care maintenance bundle: dressing inspections, chlorhexidine scrubs, utilizing prepackaged kits Strongly recommended Catheter hub, cap, or tubing maintenance bundle: disinfection of needleless connectors, replacing all elements simultaneously Strongly recommended Chlorhexidine-impregnated sponge dressing Strongly recommended Hand hygiene before maintenance and access Strongly recommended Dressings should be changed at least every 7 days Strongly recommended Daily chlorhexidine baths Strongly recommended Daily CVC need assessment Strongly recommended Intermittent flushes of some type Strongly recommended Alcohol-containing cap protectors Recommendedb Antimicrobial-impregnated catheters Recommended in high-risk patients Catheter “re-siting” or “re-wiring” Not recommended Central Venous Catheter–Associated Bloodstream Infection Prevention Strategya . Level of Recommendation . CVC insertion bundle: hand hygiene, antiseptic skin preparation, sterile barriers, utilization of a checklist and independent observer, and a CVC insertion cart or kit Strongly recommended Catheter site care maintenance bundle: dressing inspections, chlorhexidine scrubs, utilizing prepackaged kits Strongly recommended Catheter hub, cap, or tubing maintenance bundle: disinfection of needleless connectors, replacing all elements simultaneously Strongly recommended Chlorhexidine-impregnated sponge dressing Strongly recommended Hand hygiene before maintenance and access Strongly recommended Dressings should be changed at least every 7 days Strongly recommended Daily chlorhexidine baths Strongly recommended Daily CVC need assessment Strongly recommended Intermittent flushes of some type Strongly recommended Alcohol-containing cap protectors Recommendedb Antimicrobial-impregnated catheters Recommended in high-risk patients Catheter “re-siting” or “re-wiring” Not recommended Abbreviation: CVC, central venous catheter. aBased on the references put forth by the Infectious Diseases Society of America and the Society for Healthcare Epidemiology of America, published literature, and the authors’ opinion and clinical practice [1, 39]. bAssists with disinfection during maintenance/access. Open in new tab Table 1. Summary of Central Venous Catheter–Associated Bloodstream Infection Prevention Strategies Central Venous Catheter–Associated Bloodstream Infection Prevention Strategya . Level of Recommendation . CVC insertion bundle: hand hygiene, antiseptic skin preparation, sterile barriers, utilization of a checklist and independent observer, and a CVC insertion cart or kit Strongly recommended Catheter site care maintenance bundle: dressing inspections, chlorhexidine scrubs, utilizing prepackaged kits Strongly recommended Catheter hub, cap, or tubing maintenance bundle: disinfection of needleless connectors, replacing all elements simultaneously Strongly recommended Chlorhexidine-impregnated sponge dressing Strongly recommended Hand hygiene before maintenance and access Strongly recommended Dressings should be changed at least every 7 days Strongly recommended Daily chlorhexidine baths Strongly recommended Daily CVC need assessment Strongly recommended Intermittent flushes of some type Strongly recommended Alcohol-containing cap protectors Recommendedb Antimicrobial-impregnated catheters Recommended in high-risk patients Catheter “re-siting” or “re-wiring” Not recommended Central Venous Catheter–Associated Bloodstream Infection Prevention Strategya . Level of Recommendation . CVC insertion bundle: hand hygiene, antiseptic skin preparation, sterile barriers, utilization of a checklist and independent observer, and a CVC insertion cart or kit Strongly recommended Catheter site care maintenance bundle: dressing inspections, chlorhexidine scrubs, utilizing prepackaged kits Strongly recommended Catheter hub, cap, or tubing maintenance bundle: disinfection of needleless connectors, replacing all elements simultaneously Strongly recommended Chlorhexidine-impregnated sponge dressing Strongly recommended Hand hygiene before maintenance and access Strongly recommended Dressings should be changed at least every 7 days Strongly recommended Daily chlorhexidine baths Strongly recommended Daily CVC need assessment Strongly recommended Intermittent flushes of some type Strongly recommended Alcohol-containing cap protectors Recommendedb Antimicrobial-impregnated catheters Recommended in high-risk patients Catheter “re-siting” or “re-wiring” Not recommended Abbreviation: CVC, central venous catheter. aBased on the references put forth by the Infectious Diseases Society of America and the Society for Healthcare Epidemiology of America, published literature, and the authors’ opinion and clinical practice [1, 39]. bAssists with disinfection during maintenance/access. Open in new tab CVC maintenance bundles reduce CLABSI incidence [39]. Maintenance bundles target both catheter site care (dressing inspections, chlorhexidine scrubs, utilizing prepackaged kits) and catheter hub, cap, or tubing access changes (disinfection of needleless connectors, replacing all elements simultaneously) [7, 31, 40–43]. Clear occlusive dressings should be used to allow easy visual inspections [44]. Use of a chlorhexidine-impregnated sponge or dressing for nontunneled CVCs (in patients aged >2 months) has been shown to decrease infection risk [42]. Cap protectors that contain alcohol as a disinfectant reduce CLABSI rates. Though cap protectors are not necessarily required as a routine bundle element, they ensure compliance with the recommended careful and adequate cap disinfection during access [45, 46]. We routinely use alcohol-containing cap protectors in our practice because they are a convenient and reliable way to ensure compliance and streamline bedside nursing procedures. Hand hygiene should be completed before any CVC access or maintenance [39]. Education programs to train staff responsible for catheter care should be undertaken [44, 47]. When possible, dressings should be changed at least every 7 days [42]. In numerous studies, daily chlorhexidine baths have been shown to reduce the risk of bloodstream infection [1, 48–50]. The only patients for whom we do not recommend chlorhexidine bathing are premature neonates; for all other children, we recommend that chlorhexidine bathing be included in every prevention program. Antimicrobial and ethanol lock solutions function by preventing the development of biofilms of infectious organisms along catheters. Prophylactic antimicrobial or ethanol locks in patients who have a history of multiple CLABSIs reduce the frequency of recurrence and may also be helpful when attempting to keep previously infected catheters in place [1, 36, 51, 52]. If a specific organism has been identified that has susceptibility to an available antimicrobial lock, we prefer using that antimicrobial lock over an ethanol lock (directing the antimicrobial lock at the known infectious agent). In the case of a history of bloodstream infections caused by multiple or multidrug-resistant organisms, we consider ethanol locks. We also use ethanol locks for secondary prophylaxis in patients with intestinal failure and a history of CLABSI. Importantly, alcohol softens the polyurethane material of most CVCs, which may increase the risk of rupture during high-pressure infusion. Current manufacturer recommendations are that ethanol locks should not be used with polyurethane materials because alcohols soften the polyurethane material of most CVCs, which may increase the risk of rupture during high-pressure infusion. We review the manufacturer’s information for use prior to long-term use of ethanol locks, and carefully weigh the potential risks vs benefits for individual patients. Longer CVC dwell time is associated with a higher risk of infection [1, 3, 27, 35, 52, 53]. Consequently, a key element of CLABSI prevention is for the entire medical team to repeatedly assess the need for the CVC to remain in place and to remove unnecessary CVCs promptly [39, 43]. Good antimicrobial stewardship practices (eg, converting from intravenous antibiotics to oral antibiotics and prescribing the shortest antibiotic course duration necessary) as well as reducing laboratory draws and prioritizing conversion from parenteral to enteral nutrition may hasten CVC removal. Daily CVC need assessment by nursing staff and rounding checklists decrease the total number of CVC-days and are an integral part of our practice [30, 43]. Prevention of Thrombotic Complications The rate of venous thromboembolism is increasing among pediatric patients, in large part due to an increase in the use of CVCs [54]. CVCs are the single most significant risk factor for thrombus formation in children [55, 56]. In addition to high catheter-to-venous ratio, inappropriate catheter tip position may also affect thrombus formation [25, 26, 57]. Thrombi increase the risk of infection and also lead to clinical complications such as embolic stroke, pulmonary embolism, or impaired venous drainage [1, 3, 55, 58, 59]. The use of heparin prophylaxis (infusion or flushes) may reduce the risk of CVC-associated thrombi but is not yet considered as the standard of care for thrombosis prevention except in children who require total parenteral nutrition (in whom it is suggested) [59]. Several pediatric studies have shown conflicting results regarding the benefit of prophylactic anticoagulation [59–63]. The use of anticoagulation, such as heparin infusion, should be individualized based on patient thrombosis vs bleeding risk. Some clinicians also consider prophylactic heparin infusion in very young infants and in higher-risk populations (eg, children with recent cardiac surgery or significant critical illness). For older children with nontunneled CVCs, there is no strong evidence for use of prophylactic heparin flushes compared with normal saline flushes, though there is good evidence that intermittent flushes of some type prevent thrombotic or mechanical blockages [28, 59]. Heparin-bonded catheters are also available in some settings. While these catheters may offer some reduction of thrombotic risk, they have not been found to offer significant advantage compared with heparin flushes nor have they been shown to effectively prevent fibrin-associated infections when compared with antimicrobial-impregnated lines [37, 64]. Local thrombolytic agents, typically alteplase, should be administered to restore central catheter patency in the instance of a suspected catheter-associated fibrin sheath causing occlusion [59, 63]. If mechanical obstruction persists after several administrations, we suggest pursuing imaging studies to evaluate for CVC dislodgment or thrombosis, as well as considering line removal. CONCLUSIONS Most CVC complications are preventable. Prevention is best achieved by taking a holistic view of the risks associated with complications, recognizing that these risks can be both competing and additive, may change over time, and are influenced by CVC indication as well as other host-related factors. 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This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) TI - How We Approach Central Venous Catheter Safety: A Multidisciplinary Perspective JF - Journal of the Pediatric Infectious Diseases Society DO - 10.1093/jpids/piz096 DA - 2020-02-28 UR - https://www.deepdyve.com/lp/oxford-university-press/how-we-approach-central-venous-catheter-safety-a-multidisciplinary-6H5Pg1yZBN SP - 87 VL - 9 IS - 1 DP - DeepDyve ER -