A 60-year-old woman comes to the emergency department with shortness of breath. An arterial blood sample is obtained
PO2: 75 mm Hg (normal: 75 to 100 mm Hg)
PCO2: 58 mm Hg (normal: 33 to 44 mm Hg)
[HCO3-]: 24 mEq/L (normal: 22 to 28 mEq/L)
pH: 7.24 (normal: 7.35 to 7.45)
What is this woman's acid-base disorder?
A. metabolic acidosis
B. metabolic alkalosis
C. acute respiratory acidosis
D. acute respiratory alkalosis
E. chronic respiratory acidosis
ANS: C
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