Based on the following ABG results, what is the most likely acid-base diagnosis? pH = 7.01, PCO2 = 71 mm Hg, HCO3– = 16.3 mEq/L
a. Acute metabolic acidosis
b. Acute respiratory acidosis
c. Combined respiratory and metabolic aci-dosis
d. Partially compensated respiratory acidosis
ANS: C
A combined disturbance is one in which both respiratory and metabolic disturbances exist, which promote the same acid-base disturbance. For the following arterial blood gas results: a pH value of 7.01, a PaCO2 value of 71 mm Hg, and an HCO3– value of 16.3 mEq/L. The pH indicates acidemia, consistent with both the high PaCO2 and the decreased HCO3–. This is a combined ac-idosis, indicating that the patient has two primary acid-base problems (i.e., respiratory and meta-bolic alkalosis combined). Therefore, compensation is not possible.
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