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EasyRespiratoryCOPD exacerbation – oxygen therapyuk-plab-1

A 68-year-old man with COPD presents with increasing dyspnoea and purulent sputum over 3 days. His usual FEV1 is 40% predicted. On examination he has a respiratory rate 26/min, oxygen saturation 90% on air, and widespread wheeze. Which of the following is the most appropriate initial oxygen target saturation range?

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