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EasyRespiratoryAcute exacerbation of COPDuk-plab-1

A 69-year-old man with known COPD (FEV1 40% predicted) presents with increased breathlessness and productive cough. On examination, he has a respiratory rate of 24 per minute and oxygen saturations of 86% on air. Arterial blood gas on air shows PaO2 6.8 kPa, PaCO2 7.5 kPa, pH 7.32. What target oxygen saturation range should be aimed for during initial oxygen therapy?

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