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EasyRespiratoryAcute exacerbation of COPD with type 2 respiratory failureuk-plab-1

A 65-year-old man with COPD presents with increased breathlessness, purulent sputum and wheeze. On room air his SpO2 is 84%, respiratory rate 28 breaths/min, and he is using accessory muscles. Arterial blood gas on air shows: pH 7.32, PaCO2 8.0 kPa, PaO2 6.8 kPa, HCO3− 30 mmol/L. What is the most appropriate target oxygen saturation range when administering controlled oxygen therapy?

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