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Difficulty: HardReduction of Risk Potential

A critical care nurse is evaluating a client with a history of acute severe asthma who is undergoing a spontaneous breathing trial (SBT) via a T-piece. Thirty minutes into the trial, the client becomes restless and diaphoretic. The nurse draws an arterial blood gas (ABG) sample, which reveals the following results: pH 7.28, PaCO2 56 mm Hg, PaO2 62 mm Hg, and HCO3- 24 mEq/L. To mitigate the risk of physiological decompensation, which action should the nurse take immediately?

  1. Halt the spontaneous breathing trial and prepare to resume full mechanical ventilatory support.Answer
  2. B
    Administer a prescribed dose of intravenous sodium bicarbonate to correct the metabolic imbalance.
  3. C
    Place the client in a supine position to conserve energy and decrease myocardial oxygen demand.
  4. D
    Continue the trial and closely monitor the client's vital signs for an additional 15 minutes to allow for compensation.

Answer

The correct action is to halt the spontaneous breathing trial and prepare to resume full mechanical ventilatory support.
The client's ABG results demonstrate acute uncompensated respiratory acidosis (low pH, elevated PaCO2, normal HCO3-) combined with hypoxemia (low PaO2). The clinical signs of restlessness and diaphoresis, alongside these objective lab values, indicate that the client is failing the spontaneous breathing trial and experiencing profound respiratory fatigue. The immediate priority to reduce the risk of respiratory arrest is to halt the trial and reinstitute mechanical ventilation to ensure adequate alveolar ventilation and oxygenation.

Step-by-Step Solution

1
Analyze the arterial blood gas (ABG) results.
The pH of 7.28 indicates acidosis. The PaCO2 of 56 mm Hg is elevated (primary respiratory cause). The HCO3- of 24 mEq/L is normal (uncompensated). The PaO2 of 62 mm Hg is low (hypoxemia).
To identify the client's primary acid-base disturbance and oxygenation status during the weaning trial.
2
Interpret the client's overall clinical picture.
The objective data (uncompensated respiratory acidosis with hypoxemia) and subjective data (restlessness, diaphoresis) indicate that the client is failing the spontaneous breathing trial due to respiratory muscle fatigue.
To determine whether the client is successfully tolerating the transition off mechanical ventilation.
3
Determine the priority nursing intervention based on the ABCs.
The nurse must prioritize airway and breathing by stopping the trial and immediately restoring mechanical ventilatory support.
To prevent total respiratory arrest and reduce the risk of severe physiological decompensation.

Key Concept

Interpretation of Arterial Blood Gases (ABGs) and Management of Mechanical Ventilation Weaning Failure
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Reduction of Risk Potential

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