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Difficulty: MediumPulmonary and Critical Care

An emergency medical response team evaluates a 64-year-old man at the hospital's triage bay who complains of severe, progressively worsening breathlessness over the last 48 hours. He also notes a new onset of greenish-yellow sputum production and an increased frequency of coughing. His past medical history is notable for severe emphysema, type 2 diabetes mellitus, and a 45-pack-year smoking history.

Vital signs on arrival are:
Temperature: 37.8°C (100.0°F)
Heart rate: 108/min
Blood pressure: 152/92 mm Hg
Respiratory rate: 26/min
Oxygen saturation: 85% on room air

Physical examination demonstrates significant use of accessory muscles of respiration. Auscultation reveals a prolonged expiratory phase and widespread bilateral expiratory wheezing with overall decreased air movement. Cardiovascular examination shows regular tachycardia with no murmurs, gallops, or jugular venous distention. There is no lower extremity edema.

Arterial blood gas (ABG) analysis on room air reveals:
pH: 7.26
PaCO2: 65 mm Hg
PaO2: 52 mm Hg
HCO3-: 29 mEq/L

A bedside chest radiograph displays hyperinflated lung fields and flattened diaphragms, without evidence of focal opacities, pleural effusions, or cardiomegaly.

Which of the following interventions are appropriate for this patient's current condition? (Select all that apply)

  1. Initiate ventilatory support via noninvasive positive pressure ventilation (NPPV)Answer
  2. Administer systemic glucocorticoidsAnswer
  3. C
    Administer intravenous furosemide to manage presumed pulmonary edema
  4. D
    Initiate empiric broad-spectrum antibiotics covering methicillin-resistant Staphylococcus aureus and Pseudomonas aeruginosa
  5. E
    Apply Winter's formula to determine if the patient has appropriate respiratory compensation for a primary metabolic acidosis

Answer

The appropriate initial management steps for this patient are initiating noninvasive positive pressure ventilation (NPPV) and administering systemic glucocorticoids.
The correct interventions focus on addressing the acute hypercapnic respiratory failure and underlying airway inflammation. Noninvasive positive pressure ventilation (NPPV) is strongly indicated for patients with a COPD exacerbation complicated by respiratory acidosis (especially pH < 7.30), as it decreases mortality, reduces the need for intubation, and improves gas exchange. Systemic glucocorticoids (e.g., prednisone or methylprednisolone) are a cornerstone of COPD exacerbation therapy, as they rapidly reduce airway inflammation, improve lung function (FEV1), and shorten hospital stay.

Step-by-Step Solution

1
Analyze the clinical presentation and physical examination findings.
The patient has a history of emphysema and presents with worsening breathlessness, increased sputum production, and purulent sputum. Exam shows hyperinflation and wheezing without signs of fluid overload.
To differentiate between an acute exacerbation of COPD and acute decompensated heart failure.
2
Interpret the arterial blood gas (ABG) results.
The ABG reveals pH 7.26, PaCO2 65 mm Hg, and HCO3- 29 mEq/L, indicating an acute-on-chronic primary respiratory acidosis.
To determine the severity of respiratory failure and the necessity for ventilatory support.
3
Select appropriate interventions based on the diagnosis of severe COPD exacerbation with acute respiratory failure.
NPPV is indicated due to respiratory acidosis with pH < 7.30. Systemic glucocorticoids are standard of care to reduce airway inflammation.
To reverse the pathophysiologic mechanisms of the exacerbation, improve gas exchange, and prevent the need for invasive mechanical ventilation.

Key Concept

Management of acute exacerbations of chronic obstructive pulmonary disease (AECOPD) complicated by acute hypercapnic respiratory failure requires noninvasive positive pressure ventilation (NPPV) along with standard pharmacotherapy including systemic glucocorticoids, short-acting bronchodilators, and targeted (not unnecessarily broad) antibiotics.
Estimated Time:1m 30s
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Topics

Pulmonary and Critical Care

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