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Zorluk: Çok zorPhysiological Adaptation

An adult client is receiving treatment in the emergency department for status asthmaticus. Upon arrival, the client was highly agitated and exhibited severe intercostal retractions, with an initial arterial blood gas (ABG) reading of pH 7.527.52, PaCO 2_2 2626 mm Hg, and PaO 2_2 7272 mm Hg on a 100%100\% non-rebreather mask. Two hours later, the nurse notes the client is now drowsy and the wheezing is significantly diminished, though chest excursion is poor. A repeat ABG shows pH 7.377.37, PaCO 2_2 4242 mm Hg, and PaO 2_2 5454 mm Hg. Which of the following is the priority nursing action?

  1. Prepare the client for immediate endotracheal intubation and assist with mechanical ventilation.Cevap
  2. B
    Document the findings as the client's arterial blood gas values are returning to normal ranges.
  3. C
    Administer the prescribed intravenous methylprednisolone to treat the diminished breath sounds.
  4. D
    Decrease the supplemental oxygen concentration to prevent oxygen-induced hypoventilation.

Cevap

Prepare the client for immediate endotracheal intubation and assist with mechanical ventilation.
In a severe asthma exacerbation, the client initially hyperventilates, causing a low PaCO2 (respiratory alkalosis). As the client becomes exhausted, the respiratory rate drops, and PaCO2 begins to rise. A 'normal' PaCO2 in this context, combined with drowsiness and diminished breath sounds (a 'silent chest' indicating minimal air movement), is a paradoxical finding known as pseudonormalization. It signals that the client has lost the energy to maintain the work of breathing and is in impending respiratory failure. The immediate priority is securing the airway and providing mechanical ventilation.

Adım Adım Çözüm

1
Analyze the initial ABG and clinical presentation.
The initial ABG showed respiratory alkalosis due to hyperventilation, which is the expected early compensatory response to hypoxia in a severe asthma attack.
Establishing the baseline helps identify the trajectory of the client's respiratory status.
2
Evaluate the subsequent clinical changes and repeat ABG.
The client developed drowsiness and a 'silent chest' (diminished wheezing and poor excursion), while the repeat ABG showed a 'normal' pH and PaCO2 with worsening hypoxemia.
Recognizing a change in clinical status is necessary to identify complications.
3
Synthesize the findings to determine the underlying pathophysiology and priority action.
The 'normal' PaCO2 represents pseudonormalization due to respiratory muscle exhaustion. The priority is securing the airway before the client progresses to respiratory and cardiac arrest.
Airway and breathing must be stabilized immediately when impending respiratory failure is identified.

Anahtar Kavram

Pseudonormalization of arterial blood gases in status asthmaticus
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Konular

Physiological Adaptation

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