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EasyRespiratory MedicineCOPD-Oxygen Targetus-abemus-abfmus-usmle-step-2

A 62-year-old with COPD exacerbation on oxygen has PaO₂ 55 mm Hg and PaCO₂ 60 mm Hg. What oxygen saturation target minimises CO₂ retention risk while ensuring oxygenation?

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