While assessing a client experiencing an acute asthma exacerbation, the nurse notes severe… — NCLEX-RN

While assessing a client experiencing an acute asthma exacerbation, the nurse notes severe work of breathing with a respiratory rate of $36\text{ breaths/minute}$ . Initial arterial blood gas (ABG) results show a pH of $7.52$ , $PaCO_2$ of $28\text{ mmHg}$ , and $PaO_2$ of $72\text{ mmHg}$ . After one hour of continuous bronchodilator therapy, the client appears quieter, the respiratory rate decreases to $14\text{ breaths/minute}$ , and wheezing is no longer audible. A repeat ABG reveals a pH of $7.36$ , $PaCO_2$ of $44\text{ mmHg}$ , and $PaO_2$ of $62\text{ mmHg}$ . Which of the following is the priority nursing action?

Prepare for immediate endotracheal intubation and mechanical ventilation.Answer
B
Document the clinical changes as a positive response to the continuous bronchodilator therapy.
C
Administer the scheduled dose of intravenous methylprednisolone.
D
Decrease the supplemental oxygen delivery to prevent oxygen toxicity.

Answer

The priority action is to prepare for immediate endotracheal intubation and mechanical ventilation.

The correct action directly addresses a life-threatening airway emergency. A client experiencing an asthma attack should initially present with hyperventilation (respiratory alkalosis). When the respiratory rate slows, wheezing disappears (silent chest), and the PaCO2 normalizes or elevates, it signifies severe respiratory muscle fatigue. The client is losing the ability to move air and is progressing toward respiratory arrest, requiring immediate intubation.

Step-by-Step Solution

Analyze the initial assessment data.

The initial ABG showed respiratory alkalosis (pH

7.52

, PaCO2

28\text{ mmHg}

), which is an expected compensatory response as the client hyperventilates to overcome airway resistance.

Understanding the baseline helps identify deterioration.

Evaluate the reassessment findings and repeat ABG.

The client has become quieter, respiratory rate has dropped to

14\text{ breaths/minute}

, and wheezing has stopped. The repeat ABG shows a 'normal' pH (

7.36

) and PaCO2 (

44\text{ mmHg}

), with worsening hypoxemia (PaO2

62\text{ mmHg}

These findings must be correlated clinically to determine the client's actual physiological state.

Synthesize the data to determine the clinical trajectory.

The lack of wheezing combined with rising PaCO2 in an acute asthma attack signifies a 'silent chest'—a life-threatening condition where airflow is so restricted that breath sounds cannot be generated, and the respiratory muscles are too fatigued to maintain ventilation.

Recognizing impending respiratory failure dictates immediate life-saving interventions.

Select the priority intervention.

Prepare for immediate endotracheal intubation and mechanical ventilation.

Airway and breathing are the highest priorities; mechanical assistance is required when the client can no longer maintain independent ventilation.

Key Concept

Impending Respiratory Failure in Asthma (Silent Chest)

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