Based on the following ABG results, what is the most likely acid-base diagnosis? pH = 7.28, PCO2 = 53 mm Hg, HCO3– = 25.8 mEq/L
a. Acute metabolic acidosis
b. Acute respiratory acidosis
c. Partially compensated metabolic acidosis
d. Partially compensated respiratory acidosis
ANS: B
The patient is acidotic (pH <7.35). This can be caused by an elevated PCO2 or a HCO3– low. In this question the PCO2 is high. If compensation were present the HCO3– would have to be in-creased. As it is normal this is an acute (uncompensated) respiratory acidosis.
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