Which of the following is the correct interpretation of the following arterial blood gas results taken from a patient receiving no supplemental oxygen: pH = 7.37; PaCO2 = 55 mm Hg; PaO2 = 53 mm Hg; SaO2 = 88%; and HCO3– = 31 mEq/L?
a. Compensated metabolic alkalosis with mild hypoxemia
b. Compensated respiratory acidosis with moderate hypoxemia
c. Partially compensated respiratory acidosis with mild hypoxemia
d. Partially compensated respiratory acidosis with severe hypoxemia
ANS: D
The pH of 7.37 indicates acidosis, but it is compensated because it is greater than 7.35 and less than 7.40 and the HCO3– is greater than 26 mEq/L. The PaCO2 of 55 mm Hg is indicative of a res-piratory acidosis. The PaO2 of 53 mm Hg shows that the patient has moderate hypoxemia.
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