A 67-year-old male with severe emphysema presents with acute respiratory acidosis. Arterial blood gas shows pH 7.22, PaCO2 72 mmHg, PaO2 50 mmHg, and HCO3 30 mEq/L despite maximal medical therapy with nebulized bronchodilators and systemic steroids. What is the evidence-based first-line ventilatory intervention to reduce mortality and intubation rates?

Answer and explanation

Correct answer: C. Non-Invasive Positive Pressure Ventilation (NIV / BiPAP)

  1. Step 1: In acute hypercapnic respiratory failure secondary to COPD exacerbation (pH < 7.35, PaCO2 > 45 mmHg), Non-Invasive Ventilation (NIV / BiPAP) is the first-line evidence-based standard of care.
  2. Step 2: NIV reduces work of breathing, improves alveolar ventilation, and decreases the risk of invasive intubation and in-hospital mortality.
Answer
Non-Invasive Positive Pressure Ventilation (NIV / BiPAP).
Why not the others: 'Immediate endotracheal intubation' is reserved for patients who fail NIV or have contraindications (altered mental status, severe facial trauma, vomiting); 'High-flow nasal cannula at 100% FiO2' can suppress hypoxic respiratory drive and worsen hypercapnia without assisting ventilation; 'ECMO' is an advanced salvage modality.

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