A patient presents with the following values: pH, 7.20; paO2, 106 mm Hg; paCO2, 35 mm Hg; and HCO3-, 11 mEq/L. These values are most consistent with
a. uncompensated respiratory acidosis.
b. uncompensated metabolic acidosis.
c. uncompensated metabolic alkalosis.
d. uncompensated respiratory alkalosis.
B
The pH indicates acidosis, and the HCO3- is markedly decreased, indicating a metabolic disorder. Uncompensated metabolic acidosis values include a pH below 7.35, PACO2 of 35 to 45 mm Hg, and HCO3- above 22 mEq/L. Uncompensated respiratory acidosis values include a pH below 7.35, PACO2 above 45 mm Hg, and HCO3- of 22 to 26 mEq/L. Uncompensated respiratory alkalosis values include a pH above 7.45, PACO2 below 35 mm Hg, and HCO3- of 22 to 26 mEq/L. Uncompensated metabolic alkalosis values include a pH above 7.45, PACO2 of 35 to 45 mm Hg, and HCO3- above 26 mEq/L.
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