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ModerateRespiratoryAcute exacerbation of COPD with hypercapniauk-plab-1

A 72-year-old woman with COPD presents with an acute exacerbation. She is breathless at rest with oxygen saturation 85 percent on air, respiratory rate 30 breaths per minute and normal blood pressure. Arterial blood gases show pH 7.31, PaCO2 8.0 kPa and PaO2 6.5 kPa. What target oxygen saturation range should be aimed for with controlled oxygen therapy?

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