med 610 clinical respiratory diseases & critcare med

Arterial Blood Gas

Case 4

A 45 year-old woman with a history of inhalant abuse presents to the emergency room complaining of dyspnea. She has an SpO2 of 99% on room air and is obviously tachypneic on exam with what appears to be Kussmaul’s respirations. A room air arterial blood gas is performed and reveals:

  • pH 6.95
  • PCO2 9
  • PO2 128
  • HCO3- 2

A chemistry panel revealed sodium of 130, chloride 98, HCO3- 2

Acid-base status:

Alveolar-arterial oxygen difference:

Explanation for the clinical picture:

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