4.1 Care, Maintenance, and CLABSI Prevention
Key Takeaways
- Care and Maintenance is 14% of the VA-BC blueprint and centers on reliable daily line care, not only dressing technique.
- Transparent semipermeable membrane dressings are changed every 5-7 days; gauze dressings are changed every 48 hours, and either is changed sooner if compromised.
- Needleless connectors require disinfection before access and are changed with administration set changes or when integrity, residue, or contamination is a concern.
- Pulsatile flushing and positive-pressure locking support patency; resistance should trigger assessment rather than forceful flushing.
- CLABSI maintenance prevention depends on bundle reliability: hand hygiene, site assessment, hub disinfection, securement, CHG bathing where indicated, and prompt removal when access is no longer needed.
Maintenance is a bundle, not a task list
The VA-BC blueprint assigns 14% to Care and Maintenance, and practice materials repeatedly test whether the clinician can protect a device after insertion. Maintenance includes the dressing, securement, needleless connector, flushing and locking technique, site assessment, patient hygiene, and daily review of whether the catheter is still needed. A technically clean dressing change does not compensate for poor hub disinfection, avoidable line manipulation, or failure to respond when the site changes.
Think in two contamination pathways. Extraluminal contamination starts at the skin and insertion site, especially when the dressing is loose, damp, soiled, or the catheter moves. Intraluminal contamination enters through the hub or needleless connector when the access surface is not disinfected, when blood residue remains, or when connector integrity is compromised. Central line-associated bloodstream infection (CLABSI) prevention depends on consistently closing both pathways.
Dressing and site assessment rules
Transparent semipermeable membrane (TSM) dressings support ongoing site visualization and are commonly changed every 5-7 days. Gauze dressings hide the site and hold moisture, so they are changed every 48 hours. For either dressing, the interval is a maximum routine interval, not permission to wait when the dressing is damp, loose, visibly soiled, lifting at the edge, saturated with drainage, or preventing reliable assessment.
| Maintenance item | Exam-centered rule | Why it matters |
|---|---|---|
| TSM dressing | Change every 5-7 days or sooner if compromised | Allows site visualization while limiting unnecessary disruption |
| Gauze dressing | Change every 48 hours or sooner if compromised | Gauze obscures the site and may retain moisture |
| Site check | Assess at least each shift and with complaints or device use | Pain, drainage, edema, erythema, and migration are early warning cues |
| Securement | Use reliable sutureless securement when indicated | Reduces motion, migration, skin trauma, and suture-related risks |
Securement deserves separate attention. A sutureless securement device anchors the catheter without passing suture through skin. The exam may present securement as an infection-control issue, a migration issue, or a mechanical phlebitis issue. Movement at the hub can irritate the vein, loosen the dressing, change external catheter length, and create repeated opportunities for contamination.
Needleless connectors and hub disinfection
Needleless connectors are part of the access system, not disposable afterthoughts. Before each access, scrub the connector with appropriate friction and allow the disinfectant to dry. The VA-BC preparation materials describe scrubbing the hub as the maintenance bundle element that directly prevents intraluminal inoculation. Passive caps can support a local policy, but the exam logic remains the same: protect key parts and key sites every time.
Connector change timing is also tested. Needleless connectors are changed with administration set changes and when blood residue, contamination, or loss of integrity is a concern. The practice question bank frames this as no more frequently than every 96 hours unless there is a clinical indication. The point is balance: unnecessary connector changes increase manipulation, but leaving a compromised connector in place preserves a risk.
Flushing, locking, and line necessity
Pulsatile flushing uses a start-stop, push-pause motion to create turbulence in the catheter lumen. Positive-pressure locking is used to reduce blood reflux as the syringe is disconnected or the clamp is engaged. These techniques support patency, but they are not a license to push through resistance. Resistance, absent blood return, unexpected alarms, swelling, pain, leakage, or a change in external length should lead to assessment for clamps, kinks, malposition, occlusion, infiltration, extravasation, or device damage.
Flush volume depends on device, therapy, and policy. The VA-BC practice items specifically highlights larger saline flushing after blood draws or blood product administration, with 20 mL named for a PICC after blood draw. More important for exam reasoning is the sequence: verify the order and medication safety checks, assess patency, flush with correct technique, lock as indicated, and document response.
CLABSI maintenance bundle priorities
Maintenance bundle thinking includes hand hygiene, aseptic non-touch technique, hub disinfection, dressing integrity, securement, line necessity review, and patient cleansing practices. CHG bathing is highlighted locally as a maintenance-bundle strategy for ICU patients with central venous catheters. Daily necessity review matters because the most preventable line infection is one involving a line that no longer has a current indication.
On exam day, avoid all-or-nothing language. Bundles reduce risk when reliably applied; they do not make infection impossible. A safe VA-BC answer usually chooses the intervention that preserves asepsis, reduces manipulation, maintains device function, and escalates abnormal findings rather than hiding them under a new dressing.
A hospitalized patient has a PICC with an intact transparent dressing placed 6 days ago. The site is visible, dry, and without erythema or drainage. Which plan best matches VA-BC maintenance logic?
During a scheduled flush of a central line, the nurse meets unexpected resistance. What is the safest first response?