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Difficulty: HardPhysiological Adaptation

An emergency department nurse assesses a client with a history of severe chronic obstructive pulmonary disease (COPD) who presented with increased work of breathing. After receiving supplemental oxygen for two hours, the client is now profoundly somnolent and responds only to painful stimuli. The respiratory rate is 8 breaths/min8\text{ breaths/min} and shallow. Recent arterial blood gas (ABG) results are as follows:

* pH:7.18\text{pH}: 7.18
* PaCO2:84 mm Hg\text{PaCO}_2: 84\text{ mm Hg}
* HCO3−:32 mEq/L\text{HCO}_3^-: 32\text{ mEq/L}
* PaO2:70 mm Hg\text{PaO}_2: 70\text{ mm Hg}

Based on the client's current clinical presentation and laboratory results, which action should the nurse prioritize?

  1. A
    Apply a noninvasive positive pressure ventilation (BiPAP) mask.
  2. B
    Administer a prescribed intravenous dose of sodium bicarbonate.
  3. Gather equipment to assist with immediate endotracheal intubation.Answer
  4. D
    Increase the supplemental oxygen flow rate to 6 L/min6\text{ L/min}.

Answer

Gather equipment to assist with immediate endotracheal intubation.
The client is experiencing acute-on-chronic respiratory acidosis, evidenced by a pH\text{pH} of 7.187.18 and a PaCO2\text{PaCO}_2 of 84 mm Hg84\text{ mm Hg}. The profound somnolence and a respiratory rate of 8 breaths/min8\text{ breaths/min} indicate acute hypercapnic respiratory failure and an inability to maintain or protect the airway. Immediate endotracheal intubation and mechanical ventilation are essential to restore adequate alveolar ventilation, correct the severe acidemia, and protect the airway from aspiration.

Step-by-Step Solution

1
Analyze the arterial blood gas (ABG) values.
The low pH (7.18) and markedly high PaCO2 (84 mm Hg) indicate severe respiratory acidosis. The elevated HCO3- (32 mEq/L) suggests a chronic compensatory state, identifying this as acute-on-chronic respiratory acidosis.
Identifying the primary acid-base disturbance is necessary to understand the underlying physiological derangement.
2
Evaluate the client's clinical presentation.
The profound somnolence, response only to painful stimuli, and bradypnea (8 breaths/min) signify acute hypercapnic respiratory failure and a complete loss of airway protection.
ABG values must be correlated with the clinical picture to determine the acuity of the situation and the appropriate intervention.
3
Determine the safest and most effective method to restore ventilation and protect the airway.
Endotracheal intubation is required. Noninvasive ventilation (BiPAP) is contraindicated in somnolent clients due to aspiration risk.
Airway protection is the absolute highest priority in an unresponsive or deeply somnolent client experiencing respiratory failure.

Key Concept

Management of acute hypercapnic respiratory failure and contraindications for noninvasive ventilation.
Estimated Time:1m 30s
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Topics

Physiological Adaptation

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