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Zorluk: KolayPulmonary and Critical Care

A 62-year-old woman is evaluated in the emergency department due to progressively worsening shortness of breath and an increased volume of purulent sputum over the past three days. She has a 45-pack-year smoking history and a known diagnosis of advanced chronic obstructive pulmonary disease. Upon arrival, she is awake and alert but in moderate respiratory distress, speaking in short phrases and utilizing accessory muscles of respiration. Her temperature is 37.3°C (99.1°F), blood pressure is 142/86 mm Hg, pulse is 112/min, and respiratory rate is 26/min. Oxygen saturation is 87% on room air. Physical examination shows a barrel-shaped chest, hyperresonance to percussion, and diffusely diminished breath sounds with a prolonged expiratory phase and scattered expiratory wheezes. Cardiac examination reveals distant heart sounds with no murmurs, gallops, or jugular venous distention. There is no lower extremity edema.

Arterial blood gas analysis on room air reveals the following:

ParameterValue
pH7.28
PaCO268 mm Hg
PaO254 mm Hg
HCO3-31 mEq/L

Which of the following is the most appropriate next step in management?

  1. Initiation of noninvasive positive pressure ventilationCevap
  2. B
    Intravenous furosemide administration
  3. C
    Intravenous sodium bicarbonate infusion
  4. D
    Intravenous piperacillin-tazobactam therapy
  5. E
    Transport to radiology for computed tomography pulmonary angiography

Cevap

Initiation of noninvasive positive pressure ventilation
The correct answer is the initiation of noninvasive positive pressure ventilation (NPPV). This patient presents with a severe acute exacerbation of chronic obstructive pulmonary disease (COPD), evidenced by the cardinal symptoms of worsening dyspnea and increased purulent sputum. Her arterial blood gas reveals acute-on-chronic hypercapnic respiratory acidosis (pH < 7.35, PaCO2 > 45 mm Hg, and an elevated baseline bicarbonate). In alert and cooperative patients with a COPD exacerbation and respiratory acidosis, NPPV (such as bilevel positive airway pressure) is the most critical next step. It improves alveolar ventilation, decreases the work of breathing, corrects respiratory acidosis, and significantly reduces the need for invasive endotracheal intubation and associated mortality.

Adım Adım Çözüm

1
Identify the primary clinical syndrome.
The patient has an acute exacerbation of chronic obstructive pulmonary disease (COPD).
Characterized by increased dyspnea, increased sputum volume, and increased sputum purulence.
2
Analyze the arterial blood gas results.
The ABG shows a pH of 7.28, PaCO2 of 68 mm Hg, and elevated baseline bicarbonate.
This indicates acute-on-chronic respiratory acidosis (hypercapnic respiratory failure).
3
Determine the most appropriate immediate intervention.
Noninvasive positive pressure ventilation (NPPV) should be initiated.
NPPV is the standard first-line treatment for COPD exacerbations complicated by respiratory acidosis (pH < 7.35) in order to improve ventilation and avoid endotracheal intubation.

Anahtar Kavram

Noninvasive positive pressure ventilation (NPPV) is indicated for patients with a COPD exacerbation complicated by acute hypercapnic respiratory acidosis (pH < 7.35 and PaCO2 > 45 mm Hg).
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Pulmonary and Critical Care

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