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Difficulty: MediumReduction of Risk Potential

A client with a documented history of advanced emphysema arrives at the emergency department exhibiting profound lethargy and a respiratory rate of 8 breaths per minute. Paramedics report initiating supplemental oxygen at 6 liters per minute via simple face mask during transport. Stat arterial blood gas (ABG) analysis reveals a pH of 7.24, PaCO2 of 78 mm Hg, PaO2 of 65 mm Hg, and HCO3 of 35 mEq/L. Which action must the nurse prioritize to minimize the client's risk for cardiopulmonary arrest?

  1. A
    Administer a rapid-acting bronchodilator via a continuous aerosol nebulizer.
  2. Prepare the equipment for immediate noninvasive or invasive mechanical ventilation.Answer
  3. C
    Increase the supplemental oxygen flow rate to improve arterial oxygen saturation.
  4. D
    Administer prescribed intravenous sodium bicarbonate to buffer the systemic acidosis.

Answer

Prepare the equipment for immediate noninvasive or invasive mechanical ventilation.
The arterial blood gas results demonstrate uncompensated or partially compensated severe respiratory acidosis. The clinical findings of profound lethargy and a respiratory rate of 8 breaths per minute indicate CO2 narcosis, a life-threatening complication often triggered in COPD clients by the administration of excessive supplemental oxygen. The immediate priority is to support the client's breathing and blow off the excess carbon dioxide through mechanical ventilation (such as BiPAP or endotracheal intubation).

Step-by-Step Solution

1
Analyze the arterial blood gas values and vital signs.
The low pH (7.24) and high PaCO2 (78 mm Hg) indicate severe respiratory acidosis. The elevated HCO3 (35 mEq/L) shows partial metabolic compensation from chronic disease. The respiratory rate of 8 and profound lethargy indicate hypoventilation and CO2 narcosis.
Accurate interpretation of ABGs in conjunction with the clinical presentation is required to identify the primary physiological disruption.
2
Identify the etiology of the acute decompensation.
The client with advanced emphysema was given a high flow of oxygen (6 liters/minute), which suppressed their hypoxic drive to breathe, leading to dangerous carbon dioxide retention.
Understanding the pathophysiology of COPD and oxygen therapy prevents interventions that could worsen the condition.
3
Determine the highest priority intervention.
The client cannot adequately ventilate independently to clear the retained carbon dioxide, necessitating mechanical support.
According to the ABCs (Airway, Breathing, Circulation), securing the airway and assisting ventilation is the most critical action to prevent imminent cardiopulmonary collapse.

Key Concept

Management of Acute Respiratory Acidosis and CO2 Narcosis
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Topics

Reduction of Risk Potential

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