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Difficulty: MediumPhysiological Adaptation

A young adult client is brought to the emergency department experiencing a severe asthma exacerbation. Initially, the client is restless, using accessory muscles to breathe, and has loud, widespread expiratory wheezes. The initial arterial blood gas (ABG) reveals a pH of 7.487.48, PaCO2\text{PaCO}_2 of 30 mm Hg30\text{ mm Hg}, and PaO2\text{PaO}_2 of 64 mm Hg64\text{ mm Hg}. One hour later, following continuous bronchodilator therapy, the nurse notes that the client has become drowsy and the wheezing is now barely audible. A repeat ABG shows a pH of 7.317.31, PaCO2\text{PaCO}_2 of 54 mm Hg54\text{ mm Hg}, and PaO2\text{PaO}_2 of 56 mm Hg56\text{ mm Hg}. Which of the following interventions should the nurse anticipate implementing? Select all that apply.

  1. Prepare equipment for immediate endotracheal intubation and mechanical ventilationAnswer
  2. Notify the rapid response team or healthcare provider immediatelyAnswer
  3. C
    Document the diminished wheezing as an indication of effective bronchodilator therapy
  4. D
    Administer a prescribed intravenous sedative to alleviate the client's restlessness
  5. Gather a bag-valve-mask (BVM) resuscitator and ensure it is connected to a high-flow oxygen sourceAnswer
  6. F
    Lower the head of the bed to a flat, supine position to perform a comprehensive pulmonary assessment

Answer

The correct interventions are to prepare equipment for immediate endotracheal intubation, notify the rapid response team or healthcare provider immediately, and gather a bag-valve-mask (BVM) connected to high-flow oxygen.
The correct interventions focus on immediate life-saving airway management. The client's shift from respiratory alkalosis to respiratory acidosis, combined with lethargy and a sudden absence of wheezing, indicates profound respiratory muscle fatigue and impending respiratory arrest (silent chest). Preparing for intubation, obtaining a BVM with 100%100\% oxygen, and calling the rapid response team are the absolute priority actions to secure the client's airway and breathing.

Step-by-Step Solution

1
Analyze the initial clinical presentation and ABG results.
The initial ABG (pH 7.487.48, PaCO2\text{PaCO}_2 30 mm Hg30\text{ mm Hg}) indicates respiratory alkalosis due to hyperventilation, a typical early compensatory response in an asthma attack.
Establishing a baseline is necessary to recognize subsequent clinical deterioration.
2
Evaluate the subsequent clinical changes and repeat ABG results.
The repeat ABG (pH 7.317.31, PaCO2\text{PaCO}_2 54 mm Hg54\text{ mm Hg}) reveals uncompensated respiratory acidosis. Combined with drowsiness and a 'silent chest' (diminished wheezing), this indicates severe air trapping and respiratory muscle fatigue.
Identifying the shift from respiratory alkalosis to acidosis is critical for diagnosing impending respiratory failure.
3
Determine the highest priority nursing interventions based on the ABCs (Airway, Breathing, Circulation).
The client requires immediate airway stabilization and ventilatory support, making intubation preparation, a rapid response call, and BVM readiness the priority actions.
Airway and breathing are the absolute top priorities in an actively decompensating respiratory client.

Key Concept

Status asthmaticus progressing to acute respiratory failure is characterized by a shift from respiratory alkalosis to respiratory acidosis, a decreasing level of consciousness, and the sudden absence of wheezing (silent chest), requiring immediate advanced airway management.
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Topics

Physiological Adaptation

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