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Difficulty: Very hardReduction of Risk Potential

A nurse is caring for a client who is receiving total parenteral nutrition (TPN) via a right subclavian central venous catheter (CVC). Upon entering the room, the nurse discovers that the intravenous tubing has inadvertently disconnected from the CVC hub, leaving the catheter open to the air. The client is suddenly gasping for breath, grasping their chest, and exhibits a blood pressure of 76/40 mmHg76/40\text{ mmHg} with a heart rate of 138 bpm138\text{ bpm}. To immediately mitigate the risk of a fatal physiological complication, which action should the nurse perform first?

  1. Clamp the exposed catheter immediately and place the client in a left lateral Trendelenburg position.Answer
  2. B
    Clamp the exposed catheter immediately and elevate the head of the bed to a high Fowler's position to facilitate lung expansion.
  3. C
    Reconnect the intravenous tubing using strict aseptic technique and prepare to draw a stat arterial blood gas (ABG) sample.
  4. D
    Administer 100%100\% oxygen via a non-rebreather mask and continuously monitor the client for early indicators of obstructive shock.

Answer

The nurse must first clamp the exposed catheter and position the client in a left lateral Trendelenburg position.
The client is experiencing a life-threatening venous air embolism resulting from an open central line. The immediate priority is to stop further air entry by clamping the catheter. Simultaneously, the nurse must place the client in the left lateral Trendelenburg position (Durant's maneuver). This position utilizes gravity to trap the air bubble in the apex of the right ventricle, keeping it away from the pulmonary valve and allowing blood flow to bypass the obstruction, thereby temporarily restoring cardiac output and reducing the risk of sudden cardiac arrest.

Step-by-Step Solution

1
Identify the clinical emergency based on the assessment data.
The open central venous catheter combined with sudden respiratory distress and profound cardiovascular collapse (hypotension, tachycardia) indicates a massive venous air embolism.
Negative intrathoracic pressure during inspiration pulls atmospheric air directly into the central venous system through the open catheter hub.
2
Determine the physiological mechanism of the complication.
The air travels to the right side of the heart, forming an air lock in the right ventricle or pulmonary outflow tract.
This mechanical obstruction prevents blood from reaching the lungs, leading to acute obstructive shock and rapidly deteriorating hemodynamics.
3
Select the immediate priority intervention to reduce the risk of mortality.
The nurse must immediately occlude the source (clamp the catheter) and utilize gravity (left lateral Trendelenburg position) to displace the air bubble away from the pulmonary valve.
This specific positioning (Durant's maneuver) traps the air in the apex of the right ventricle, allowing blood to flow underneath the air bubble and temporarily restoring cardiac output while emergency assistance is summoned.

Key Concept

Venous Air Embolism Emergency Management
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Topics

Reduction of Risk Potential

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