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Difficulty: MediumPhysiological Adaptation

An adult client is receiving care in the emergency department for a severe asthma exacerbation. The initial arterial blood gas (ABG) on room air indicated pH=7.48\text{pH} = 7.48, PaCO2=28 mm Hg\text{PaCO}_2 = 28 \text{ mm Hg}, and HCO3−=23 mEq/L\text{HCO}_3^- = 23 \text{ mEq/L}. Two hours later, the nurse observes that the client has become extremely lethargic and their respiratory effort has noticeably decreased. A follow-up ABG reveals pH=7.29\text{pH} = 7.29, PaCO2=56 mm Hg\text{PaCO}_2 = 56 \text{ mm Hg}, and HCO3−=24 mEq/L\text{HCO}_3^- = 24 \text{ mEq/L}. Which action is the highest priority for the nurse to take?

  1. Activate the rapid response team and prepare for immediate airway management.Answer
  2. B
    Administer an intravenous infusion of sodium bicarbonate to neutralize the systemic acidity.
  3. C
    Instruct the client to breathe into a paper bag to stabilize the carbon dioxide level.
  4. D
    Perform a comprehensive auscultation of all lung fields before notifying the healthcare provider.

Answer

Activate the rapid response team and prepare for immediate airway management.
The correct action is to activate the rapid response team and prepare for advanced airway management. During an acute asthma attack, clients initially hyperventilate, blowing off CO2\text{CO}_2 and causing respiratory alkalosis. If the client becomes fatigued, their respiratory rate and depth decrease, leading to CO2\text{CO}_2 retention, hypercapnia, and respiratory acidosis. In the context of a severe asthma exacerbation, new-onset lethargy combined with a rising PaCO2\text{PaCO}_2 is an ominous sign of impending respiratory failure and requires immediate mechanical ventilation.

Step-by-Step Solution

1
Analyze the initial ABG results.
pH=7.48\text{pH} = 7.48 (alkalosis) and PaCO2=28\text{PaCO}_2 = 28 (low) indicate respiratory alkalosis, which is expected early in an asthma attack due to rapid breathing and hyperventilation.
Establishing the baseline helps identify clinical trends.
2
Analyze the follow-up ABG results and clinical presentation.
pH=7.29\text{pH} = 7.29 (acidosis) and PaCO2=56\text{PaCO}_2 = 56 (high) indicate uncompensated respiratory acidosis. The client is now lethargic with decreased respiratory effort.
Correlating laboratory values with physical symptoms is essential for accurate clinical judgment.
3
Synthesize the findings to determine the client's physiological state.
The transition from alkalosis to acidosis in asthma signifies that the client's respiratory muscles are severely fatigued. They can no longer maintain the work of breathing, leading to CO2\text{CO}_2 retention and impending respiratory arrest.
Recognizing this classic pattern of physiological decompensation dictates the urgency of the required intervention.
4
Select the highest priority intervention.
Activating the rapid response team for advanced airway management (intubation and mechanical ventilation) is the critical life-saving action.
Airway and Breathing take absolute priority (ABCs) over further assessment or incorrect pharmacological treatments.

Key Concept

Impending respiratory failure in asthma is characterized by a transition from respiratory alkalosis to respiratory acidosis due to muscle fatigue, requiring immediate mechanical ventilation.
Estimated Time:1m 30s
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Topics

Physiological Adaptation

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