# A registered nurse (RN) is supervising a licensed practical nurse (LPN) who is caring for a patient with a central venous catheter for chemotherapy administration. Which observation by the RN requires immediate intervention?

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## 문제

A registered nurse (RN) is supervising a licensed practical nurse (LPN) who is caring for a patient with a central venous catheter for chemotherapy administration. Which observation by the RN requires immediate intervention?

The RN is conducting routine supervision of an LPN providing care to a patient with a central venous catheter for chemotherapy administration.

## 보기

1. The LPN wears sterile gloves when accessing the central line port
2. The LPN cleanses the injection port with alcohol for 15 seconds before access
3. The LPN flushes the catheter with normal saline before and after medication administration
4. The LPN disconnects the IV tubing to take a shower without clamping the catheter **✔ 정답**

**정답: 4**

## 해설

Disconnecting IV tubing without clamping the catheter requires immediate intervention because it risks air embolism, bleeding, and infection due to an open central line. Other options demonstrate proper CVC care practices within LPN scope.

## 심화 해설

Understanding the Immediate Risk: Air Embolism

The observation requiring immediate intervention is the LPN disconnecting the IV tubing to allow a patient to shower without first clamping the central venous catheter. This action creates a direct, open pathway between the atmosphere and the patient's central venous system, which is the primary setup for a life-threatening venous air embolism (VAE).

Pathophysiology and Clinical Rationale

A central venous catheter (CVC) tip resides in the superior vena cava or right atrium, where venous pressure is low or can become negative relative to atmospheric pressure. When the catheter lumen is open to air, as occurs with a disconnected, unclamped hub, a pressure gradient is established that can entrain air directly into the venous circulation [2][3]. The volume and rate of air entry are the critical determinants of severity. A large or rapid air bolus can obstruct the right ventricular outflow tract, leading to acute cardiovascular collapse, or it can travel through a patent foramen ovale (paradoxical embolism) to the cerebral circulation, causing a fatal ischemic stroke [2][4]. The case reports in the provided evidence demonstrate that this complication can occur even days after CVC placement, highlighting that the risk is constant and not limited to the insertion or removal procedures [2].

Analysis of Each Observation

To understand why option 4 is the only action demanding immediate intervention, a review of each scenario against evidence-based safety principles is necessary.

| Observation | Safety Analysis | Requires Immediate Intervention? |
| --- | --- | --- |
| 1. The LPN wears sterile gloves when accessing the central line port. | Accessing a CVC port is a sterile procedure due to the high risk for central line-associated bloodstream infection (CLABSI). Using sterile gloves is a correct and expected practice. This action is safe. | No |
| 2. The LPN cleanses the injection port with alcohol for 15 seconds before access. | Mechanical scrubbing of the needleless connector with an appropriate antiseptic (e.g., 70% alcohol) for a sufficient duration (typically 15-30 seconds) is a core component of infection prevention. This action demonstrates proper technique. | No |
| 3. The LPN flushes the catheter with normal saline before and after medication administration. | Flushing with normal saline before medication administration confirms catheter patency, and flushing after administration clears the lumen of medications, preventing incompatibility and precipitation. This is a standard, safe practice. | No |
| 4. The LPN disconnects the IV tubing to take a shower without clamping the catheter. | This is a critical safety violation. Disconnecting the closed system without first clamping the catheter creates an open portal for air entry. The sitting or standing position during a shower can further lower intrathoracic venous pressure, increasing the risk of air entrainment [3]. A fatal cerebral air embolism from CVC mishandling, as described in the evidence, is a direct consequence of such an event [2]. | Yes |

The Critical Importance of Catheter Clamping

The evidence underscores that prevention of air embolism hinges on maintaining a closed system and avoiding any open communication between the catheter lumen and atmospheric air . Clamping the catheter before any disconnection is a non-negotiable safety step. The case report by Rundblad et al. explicitly describes a fatal cerebral air embolism resulting from CVC mishandling, which directly aligns with the mechanism of an unclamped, disconnected catheter [2]. Furthermore, the integrative review by Benetti et al. identifies the modification of CVC handling techniques as a key factor in reducing air embolism occurrence . The act of clamping is the simplest and most effective modification to prevent this complication during routine care activities like showering. The potential for a negative venous pressure during a sitting position, as noted in the case of iatrogenic VGE, makes the scenario of an unclamped, disconnected catheter in a showering patient exceptionally hazardous [3].References (research sources)

- [2]Fatal Cerebral Air Embolism Following Central Venous Catheter Mishandling in a Stroke Patient: A Case Report.Case reportRundblad LIS, Lukassen TG, Grynnerup AG, Abdulmunem SA, Iversen HK, West AS. (2026) · DOI: 10.1155/crcc/6367510

- [3]Beyond Bubble Resolution: Neurological Recovery After Iatrogenic Gas Embolism–Induced Cardiac Arrest Treated with Hyperbaric Oxygen — A Case ReportCase reportKORTLI S, SHAFRAN A. (2026) · DOI: 10.21203/rs.3.rs-9587527/v1

- [4]Cerebral venous air embolism, a hidden precursor of arterial ischemia: a case report.Case reportRiachy MA, Eid HD, Haouchan RN, Matta CY, Khaled KJA. (2026) · DOI: 10.1186/s13256-025-05790-2

## 임상 시나리오

Clinical Safety Alert: Central Line Air Embolism Prevention

The immediate risk when a central venous catheter is disconnected without clamping is a venous air embolism (VAE). The catheter tip sits in the low-pressure central venous system, where negative intrathoracic pressure during inspiration can draw air directly into the heart. This can cause acute right ventricular outflow obstruction, cardiovascular collapse, or a paradoxical embolism leading to stroke.

Immediate Intervention Protocol

- Stop the unsafe act immediately. Instruct the LPN to clamp the catheter or occlude the open hub with a sterile gloved finger if a clamp is not immediately available.

- Place the patient in the left lateral Trendelenburg position (Durant's maneuver) if an air embolism is suspected. This traps air in the right atrium apex, preventing it from entering the pulmonary artery.

- Administer high-flow oxygen to reduce the size of the air embolus by promoting nitrogen washout.

- Notify the physician or rapid response team immediately and monitor for sudden onset dyspnea, chest pain, hypotension, or a mill-wheel murmur.

Delegation and Supervision Guidelines

When supervising an LPN caring for a patient with a CVC, the RN must ensure the LPN understands that the catheter must never be left open to air. All line disconnections, including for showering or tubing changes, require the catheter to be clamped securely. LPNs can perform routine CVC care and medication administration per facility policy, but the RN retains accountability for verifying competency and intervening when a life-threatening breach in protocol is observed.

Best Practice for Showering with a CVC

To safely disconnect IV tubing for a shower, the LPN should first clamp the catheter, then disconnect the tubing, and immediately apply a sterile dead-end cap or needleless connector to the hub. The catheter and dressing must be covered with an impermeable waterproof dressing to prevent infection. Reconnection must follow strict aseptic technique, including scrubbing the hub for 15 seconds with alcohol or chlorhexidine before reattaching new sterile tubing.

## 핵심 개념

- **Venous Air Embolism (VAE)** — A life-threatening condition where air enters the venous circulation, potentially obstructing the right ventricular outflow tract or causing a paradoxical embolism to the brain.
- **Central Venous Catheter (CVC)** — A catheter whose tip terminates in the superior vena cava or right atrium, used for administering medications, fluids, and for hemodynamic monitoring.
- **Scrub-the-Hub** — A standard infection control practice involving mechanical scrubbing of the needleless connector or injection port with an appropriate antiseptic for a specified duration before accessing the line.
- **Paradoxical Embolism** — An embolism that originates in the venous system but crosses into the arterial circulation, typically through a patent foramen ovale, potentially causing a stroke.

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