Which set of arterial blood gas values represents partially compensated metabolic acidosis?
A. pH 7.28, HCO3– 19 mEq/L, PCO2 45 mm Hg, PO2 96 mm Hg
B. pH 7.45, HCO3–22 mEq/L, PCO2 40 mm Hg, PO2 98 mm Hg
C. pH 7.32, HCO3– 17 mEq/L, PCO2 25 mm Hg, PO2 98 mm Hg
D. pH 7.48, HCO3– 28 mEq/L, PCO2 45 mm Hg, PO2 92 mm Hg
C
The pH is lower than normal, indicating mild acidosis. The acidosis is metabolic in origin, as in-dicated by the normal arterial oxygen partial pressure and the low bicarbonate level. The de-creased carbon dioxide level indicates an increased respiratory rate, causing the carbon dioxide to be "blown off," bringing the pH closer to normal (but not completely normal). Thus, the me-tabolic acidosis is only partially compensated by the respiratory effort.
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