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Difficulty: HardPhysiological Adaptation

An emergency department team is treating a client with advanced chronic obstructive pulmonary disease (COPD) who arrived via ambulance due to worsening lethargy and severe dyspnea. The client is currently on a 2 L/min nasal cannula.

Clinical Data:
* Neurological: Somnolent but rousable to verbal stimuli
* Vital Signs: HR 118 bpm, RR 10 breaths/min and shallow, BP 142/86 mm Hg
* Arterial Blood Gas (ABG): pH 7.24, PaCO2 76 mm Hg, PaO2 54 mm Hg, HCO3 33 mEq/L

Based on the clinical presentation and laboratory results, which action is the priority?

  1. Prepare to assist with the initiation of noninvasive positive-pressure ventilation (NIPPV).Answer
  2. B
    Administer an intravenous sodium bicarbonate infusion to correct the metabolic acidosis.
  3. C
    Decrease the oxygen flow rate to 1 L/min to prevent suppression of the hypoxic drive.
  4. D
    Guide the client through active coughing and deep-breathing exercises to clear airway secretions.

Answer

Prepare to assist with the initiation of noninvasive positive-pressure ventilation (NIPPV).
The client is in acute hypercapnic respiratory failure (CO2 narcosis), evidenced by somnolence, a low respiratory rate (10 breaths/min), and severe respiratory acidosis (pH 7.24, PaCO2 76 mm Hg). Noninvasive positive-pressure ventilation (NIPPV) provides ventilatory support, increasing tidal volume and alveolar ventilation to blow off excess CO2, correct the acidosis, and improve oxygenation without the immediate need for invasive endotracheal intubation.

Step-by-Step Solution

1
Analyze the Arterial Blood Gas (ABG) values.
pH is 7.24 (acidosis), PaCO2 is 76 mm Hg (severe respiratory acidosis), and PaO2 is 54 mm Hg (severe hypoxemia). HCO3 is 33 mEq/L (partial metabolic compensation).
Accurate ABG interpretation is required to identify the primary acid-base disturbance and the severity of respiratory failure.
2
Correlate ABG findings with the client's clinical presentation.
The client is somnolent with a shallow respiratory rate of 10 breaths/min.
Severe hypercapnia (high PaCO2) causes central nervous system depression (CO2 narcosis), leading to hypoventilation and lethargy.
3
Determine the highest priority intervention based on the ABCs (Airway, Breathing, Circulation).
The client requires immediate mechanical assistance to breathe (ventilation) because they are failing to clear CO2 independently.
NIPPV is the first-line therapy to rapidly improve ventilation, reduce PaCO2, and reverse acute respiratory acidosis in arousable COPD clients before respiratory arrest occurs.

Key Concept

Management of Acute-on-Chronic Respiratory Acidosis in COPD
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Topics

Physiological Adaptation

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