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HardRespiratorySevere COPD long-term oxygen therapyau-amcau-racp

A 70-year-old man with severe COPD (FEV1 25% predicted) is on maximal inhaled therapy and is stable. His resting oxygen saturation is 88% on room air, confirmed on repeated measurements over several weeks while clinically stable. What is the most appropriate next step in long-term management?

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