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Difficulty: HardReduction of Risk Potential

A nurse is caring for a client with acute respiratory distress syndrome (ARDS) who is receiving positive-pressure mechanical ventilation. The client's high-pressure ventilator alarm begins sounding continuously, and the nurse notes that the client has become highly agitated. The latest arterial blood gas (ABG) results show a pH of 7.217.21, PaCO2\text{PaCO}_2 of 72 mm Hg72\text{ mm Hg}, PaO2\text{PaO}_2 of 52 mm Hg52\text{ mm Hg}, and HCO3−\text{HCO}_3^- of 25 mEq/L25\text{ mEq/L}. Over the last 10 minutes, the client's blood pressure has dropped from 122/76 mm Hg122/76\text{ mm Hg} to 84/42 mm Hg84/42\text{ mm Hg}, and the heart rate has increased from 98 bpm98\text{ bpm} to 136 bpm136\text{ bpm}. Auscultation reveals absent breath sounds over the right lung field. Which action is the highest priority for the nurse to take to reduce the risk of cardiovascular collapse?

  1. Prepare the client for an emergent needle thoracostomy.Answer
  2. B
    Administer a rapid intravenous bolus of 0.9% sodium chloride.
  3. C
    Reposition the client into the right lateral decubitus position.
  4. D
    Administer intravenous sodium bicarbonate to correct the acidosis.

Answer

The correct action is to prepare the client for an emergent needle thoracostomy.
The client is exhibiting classic signs of a tension pneumothorax, a known complication of positive-pressure ventilation (barotrauma). The high-pressure ventilator alarm, sudden hypotension, tachycardia, severe hypoxemia, and absent unilateral breath sounds indicate that air is trapped in the pleural space, causing a mediastinal shift and obstructive shock. The immediate life-saving intervention to reduce the risk of cardiovascular collapse is a needle thoracostomy to release the trapped air.

Step-by-Step Solution

1
Analyze the client's clinical presentation and assessment findings.
The client has a sudden onset of severe hypotension, tachycardia, absent breath sounds on the right side, and a continuously sounding high-pressure ventilator alarm.
Identifying acute changes in vital signs and physical assessment helps determine the underlying physiological complication.
2
Correlate the clinical findings with the arterial blood gas (ABG) results.
The ABG demonstrates severe, uncompensated respiratory acidosis (low pH, significantly elevated PaCO2), indicating a sudden, catastrophic failure of ventilation.
Understanding the gas exchange failure confirms a severe structural or mechanical impairment in the pulmonary system.
3
Diagnose the specific complication based on the synthesis of all data.
The combination of positive-pressure mechanical ventilation, absent unilateral breath sounds, high airway pressures, and obstructive shock strongly indicates a right-sided tension pneumothorax.
Recognizing a tension pneumothorax (barotrauma) is critical because it is a life-threatening emergency requiring a specific, immediate intervention.
4
Determine the highest priority risk-reduction intervention.
The immediate life-saving action is to release the trapped intrapleural air via an emergent needle thoracostomy, followed by chest tube insertion.
Decompressing the pleural space removes the mechanical pressure on the mediastinum, restoring venous return to the heart and resolving the obstructive shock.

Key Concept

Early recognition and emergency management of a tension pneumothorax as a complication of positive-pressure mechanical ventilation.
Estimated Time:1m 30s
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Reduction of Risk Potential

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