med 610 clinical respiratory diseases & critcare med

Arterial Blood Gas

Case 6

A climber is coming down from the summit of Mt. Everest. At an altitude of 8,400 m (PB ~ 272 mmHg), he has a blood gas drawn while breathing ambient air as part of a research project. The blood gas reveals

  • pH 7.55,
  • PCO2 12,
  • PO2 30
  • and HCO3- 10.5

Acid-base status:

Alveolar-arterial oxygen difference:

Explanation for the clinical picture:

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