Clinical Correlates of pH Levels
Problem Set
Problem 9: Hyperventilation
Correct!
A 19-year-old male presents to the emergency room with the following blood gases:
| Patient's Value | Normal Value |
|
| pH | 7.55 | 7.35-7.45 |
| pCO2 | 25 mm Hg | 35-45 mm Hg |
| [HCO3-] | 22 mmol/liter | 24-28 mmol/liter |
His companions report that he was "trying to set the world record for holding his breath underwater", but had fainted after hyperventilating for 15 minutes.
What condition does this patient appear to have?
A. uncompensated respiratory alkalosis B. uncompensated metabolic alkalosis C. partially compensated respiratory alkalosis The pCO2 value, which varies from normal in the opposite direction to pH, is the cue to a respiratory problem. The lowered HCO3- represents an attempt by the kidney to compensate, which is only partial in this case.D. partially compensated metabolic alkalosis
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The University of Arizona
January 19, 1999
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