Which set of arterial blood gas values indicates early pneumonia as the respiratory problem?
A. pH 7.35, HCO3– 22 mEq/L, PCO2 45 mm Hg, PO2 86 mm Hg
B. pH 7.30, HCO3– 22 mEq/L, PCO2 60 mm Hg, PO2 92 mm Hg
C. pH 7.32, HCO3– 17 mEq/L, PCO2 25 mm Hg, PO2 98 mm Hg
D. pH 7.30, HCO3– 28 mEq/L, PCO2 65 mm Hg, PO2 75 mm Hg
A
The gas exchange affected by pneumonia is oxygen. Excess carbon dioxide retention is not usually a problem but hypoxemia is present. The pH is at the low range of normal and bicarbonate is neither synthesized nor excreted as a compensatory mechanism.
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