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MediumRespiratoryAcute exacerbation of COPDau-acemau-amc

A 72-year-old man with known COPD is brought to the emergency department with increased dyspnoea and productive cough. Arterial blood gas on room air shows pH 7.30, PaCO2 60 mmHg and PaO2 50 mmHg. Pulse oximetry reads 84%. What is the most appropriate initial oxygen saturation target while commencing controlled oxygen therapy?

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