You give a 35-year-old man, scheduled as a day case for hand surgery, a volatile anaesthetic with fentanyl, sevoflurane and nitrous oxide. At the end of surgery you switch off nitrous oxide and sevoflurane and the patient is allowed to breathe room air on the way to recovery. Which of the following is most likely to account for an SpO2 of 88% on arrival in recovery?

Select one answer from the options, then select Submit.

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