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Difficulty: HardReduction of Risk Potential

A nurse is caring for a client with acute respiratory distress syndrome (ARDS) who is intubated and receiving mechanical ventilation. The ventilator settings include a positive end-expiratory pressure (PEEP) of 15 cm H2OH_2O. The most recent arterial blood gas (ABG) analysis indicates a pH of 7.297.29, PaCO2PaCO_2 of 5454 mm Hg, HCO3−HCO_3^- of 2525 mEq/L, and PaO2PaO_2 of 6262 mm Hg. Over the last 1010 minutes, the client's blood pressure drops rapidly from 115/72115/72 mm Hg to 82/4882/48 mm Hg, and the heart rate increases from 9595 to 132132 bpm. Which action should the nurse implement first to reduce the client's risk of imminent physiological collapse?

  1. A
    Place the client in a Trendelenburg position to rapidly increase venous return and systemic blood pressure.
  2. Auscultate bilateral lung sounds and evaluate chest excursion to assess for a suspected tension pneumothorax.Answer
  3. C
    Administer an intravenous bolus of sodium bicarbonate to correct the uncompensated metabolic acidosis.
  4. D
    Perform immediate endotracheal suctioning to clear airway resistance that is causing the acute hypercapnia.

Answer

The nurse must first auscultate bilateral lung sounds and evaluate chest excursion to determine if the client has developed a tension pneumothorax.
The correct action prioritizes focused physical assessment to identify a life-threatening complication of high PEEP. Clients with ARDS requiring high levels of PEEP are at extreme risk for barotrauma, such as a tension pneumothorax. The sudden onset of profound hypotension and tachycardia strongly suggests this complication, as the trapped air increases intrathoracic pressure and severely impairs venous return to the heart. Auscultating for absent or diminished breath sounds is the critical first step to confirm this diagnosis before preparing for emergency needle decompression.

Step-by-Step Solution

1
Analyze the arterial blood gas (ABG) values.
The low pH (7.297.29) combined with an elevated PaCO2PaCO_2 (5454 mm Hg) and a normal HCO3−HCO_3^- (2525 mEq/L) indicates uncompensated respiratory acidosis.
Establishing the baseline acid-base status prevents inappropriate treatments for metabolic imbalances.
2
Evaluate the sudden change in the client's hemodynamic status.
The client has developed acute hypotension (82/4882/48 mm Hg) and significant tachycardia (132132 bpm).
Sudden hemodynamic instability in an intubated client signals severely decreased cardiac output, requiring immediate investigation of the root cause.
3
Correlate the mechanical ventilation settings with the new assessment findings.
The use of high PEEP (15 cm H2OH_2O) places the client at an extreme risk for barotrauma, specifically alveolar rupture leading to a tension pneumothorax.
A tension pneumothorax traps air in the pleural space, severely increasing intrathoracic pressure, which compresses the vena cava, restricts venous return, and causes rapid circulatory collapse.
4
Determine the safest priority nursing intervention.
Physical assessment of the lungs (auscultation and observation of chest excursion) is selected as the immediate first step.
Confirming the presence of absent or diminished breath sounds on one side is clinically required before preparing the client for an emergency needle decompression or chest tube insertion.

Key Concept

Complications of Mechanical Ventilation: Barotrauma and Hemodynamic Compromise
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Reduction of Risk Potential

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