Central line infections are preventable. Hospitals that consistently follow a set of evidence-based practices, known as a “bundle,” have reduced these infections dramatically. A single central line-associated bloodstream infection (CLABSI) carries a 12 to 25 percent mortality rate and costs an average of $70,696 per case. The good news: every step in prevention is straightforward, and the data behind each one is strong.
The Prevention Bundle Approach
Prevention works best when multiple strategies are applied together rather than in isolation. The CDC and the Society for Healthcare Epidemiology of America (SHEA) recommend bundling practices so that every central line insertion and every day of maintenance follows the same checklist. Hospitals that adopt these bundled strategies and track compliance see sustained drops in infection rates. The core components cover five areas: hand hygiene, maximal sterile barriers during insertion, chlorhexidine skin antisepsis, optimal site selection, and prompt removal of unnecessary lines.
Hand Hygiene Before Every Contact
Hand hygiene is performed before and after palpating the insertion site, and before and after inserting, replacing, accessing, repairing, or re-dressing the catheter. Either conventional soap and water or an alcohol-based hand rub works. The critical point is timing: once an antiseptic has been applied to the skin, the site should not be touched again unless sterile technique is maintained. Sterile gloves are required for inserting central lines, arterial lines, and midline catheters.
Maximal Sterile Barriers at Insertion
Every central line insertion requires full barrier precautions. That means a cap, mask, sterile gown, sterile gloves, and a sterile full-body drape covering the patient. This applies to initial placement, PICC insertions, and guidewire exchanges. Cutting corners on any single element weakens the protection. The person inserting the line and anyone assisting should all be fully gowned and masked.
Skin Antisepsis With Chlorhexidine
The skin at the insertion site should be cleaned with a chlorhexidine preparation of greater than 0.5% combined with alcohol, both before insertion and during every dressing change. A 2% chlorhexidine in alcohol solution is the most commonly used formulation. If a patient has a chlorhexidine allergy, iodine-based solutions or 70% alcohol are alternatives. One detail that often gets missed: the antiseptic must be allowed to dry completely before the catheter is placed or a new dressing is applied. Wet antiseptic does not provide full protection and can irritate the skin under an occlusive dressing.
Choosing the Right Insertion Site
Where the catheter goes matters significantly. In adult patients, the subclavian vein carries the lowest infection risk. A large randomized trial published in the New England Journal of Medicine compared the three common sites and found complication rates of 1.5 per 1,000 catheter-days for subclavian lines, 3.6 for jugular, and 4.6 for femoral. That makes the femoral site roughly three times riskier than subclavian for bloodstream infection and blood clots combined.
The CDC recommends avoiding the femoral vein in adults altogether when possible. The 2022 SHEA compendium elevated the subclavian site to a preferred, essential-practice recommendation for ICU patients specifically. Of course, patient anatomy, coagulation status, and clinical circumstances sometimes dictate a different choice, but subclavian should be the default when it’s feasible.
Chlorhexidine-Containing Dressings
The 2022 SHEA update reclassified chlorhexidine-impregnated dressings from an optional “special approach” to an essential practice for patients older than 2 months. These dressings continuously release antiseptic around the insertion site, adding a layer of protection between dressing changes. Transparent semipermeable dressings should be changed every 7 days, while gauze dressings need replacement every 48 hours. Either type should be changed sooner if it becomes damp, loosened, or visibly soiled. Topical antibiotic ointments should not be applied to the insertion site (except on dialysis catheters), because they can promote fungal infections and antibiotic resistance.
Scrubbing the Hub
Every time a needleless connector is accessed, it needs to be disinfected first. This practice, commonly called “scrub the hub,” involves vigorously wiping the connector with a chlorhexidine-alcohol or 70% alcohol pad. Current guidelines don’t specify an exact number of seconds, but research testing different durations found that 15 seconds of scrubbing was significantly less effective than longer durations, while 30 seconds performed comparably to 60 seconds. After scrubbing, allowing the connector to dry for about 30 seconds before access is important. Many hospitals standardize on a 15-second scrub as a minimum, but the evidence supports aiming for at least 30 seconds when feasible.
Daily Review of Line Necessity
Every central line that stays in place is another day of infection risk. The single most effective maintenance strategy is asking one question every day during rounds: does this patient still need this line? Prompt removal of any catheter that is no longer essential is a top-tier CDC recommendation. Structured approaches work better than relying on memory. Some ICUs use rounding checklists that explicitly review line necessity, the number of access points being used, site integrity, and how long the line has been in place. When teams build this question into their daily workflow, lines come out sooner and infection rates drop.
Ultrasound-Guided Placement
Using ultrasound to guide catheter insertion was upgraded to a high-quality recommendation in the 2022 SHEA compendium. Ultrasound reduces the number of needle passes, lowers the risk of mechanical complications like accidental arterial puncture, and helps confirm correct vein selection on the first attempt. Fewer insertion attempts mean less tissue trauma and less opportunity for bacteria to enter.
Chlorhexidine Bathing in the ICU
Daily bathing of ICU patients with chlorhexidine gluconate is an essential practice for reducing skin colonization with the bacteria most likely to cause line infections. This recommendation applies to patients older than 2 months. The rationale is simple: bacteria on the skin migrate along the catheter into the bloodstream, so reducing the overall bacterial load on the patient’s skin lowers that risk. Chlorhexidine bathing is typically done with pre-moistened cloths and replaces standard soap-and-water baths for patients with central lines.
Tubing Replacement Schedules
The 2022 guidelines extended the interval for replacing administration sets not used for blood, blood products, or fat-containing solutions from every 4 days to every 7 days. This change was based on evidence showing no increase in infection with the longer interval. Tubing used for blood products or lipid emulsions still needs more frequent replacement because these substances support bacterial growth. Standardizing tubing changes to a predictable schedule reduces both unnecessary line manipulation and the chance of forgetting overdue replacements.
Staffing and Competency
Only personnel who have been trained and have demonstrated competence should insert or maintain central lines. This is not a soft recommendation. Adequate nurse-to-patient ratios in the ICU are classified as an essential practice because overworked nurses have less time for the meticulous steps that prevent infection: proper hand hygiene, careful dressing changes, thorough hub disinfection, and daily reassessment of whether the line is still needed. Hospitals that invest in ongoing education and competency verification for line insertion and maintenance see measurably lower CLABSI rates.