A 48-year-old male has been admitted with a 24 hour history…

A 48-year-old male has been admitted with a 24 hour history of abdominal distention and profuse vomiting. A CT scan reveals a large mass causing bowel obstruction. As part of the patient’s assessment, the surgical registrar requests that you check his blood gas (on air), with the results shown below: PaO2: 12.7 kPa (11 – 13 kPa) || 95.2 mmHg (82.5 – 97.5 mmHg) pH: 7.50 (7.35 – 7.45) PaCO2: 5.5 kPa (4.7 – 6.0 kPa) || 41 mmHg (35.2 – 45 mmHg) HCO3-: 29 (22 – 26 mEq/L) BE: +3 (-2 to +2)