ABG – 2

Clinical Chemistry

An 18 year old man presents to A&E after failing his A level results

He complains of light headedness and dizzyness and the following ABG is taken.

pH7.497.35-7.45
PO222>10.6
Pa CO22.44.7-6
HCO32-2720-28
Base excess-1.6+/- 2

What is the most likely diagnosis?

  • None of the listed diagnoses
  • Alcohol intoxicatoin
  • Diabetic ketoacidosis
  • Deliberate Overdose of Aspirin
  • Illicit Drug use
  • Vomiting
  • Acute renal failure
  • Sepsis
  • Diarrhoea
  • Neuromuscular failure
  • Acute Asthma

None of the listed diagnoses

The most likely cause is hyperventilation. There is no mention of wheeze to suggest asthma. You would not expect such a high PO2 in an acute asthma attack. The treatment here: breathe into brown paper bag.