What oxygen saturation target is recommended for a patient with an exacerbation of COPD at risk of hypercapnic respiratory failure?
Answer and explanation
Correct answer: B. 88 to 92 percent
- Step 1: In chronic carbon dioxide retainers, uncontrolled oxygen can worsen hypercapnia by altering ventilation-perfusion matching. Step 2. Guidelines therefore aim for a lower target with controlled oxygen and blood gas checks. Answer: 88 to 92 percent. Why not the others: A normal target risks carbon dioxide narcosis. 100 percent is never the aim. A target as low as 80 percent allows dangerous hypoxia.
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