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A patient arrives in the emergency department with a respiratory rate of 4 breaths/minute. She is not intubated. Overdose with a centrally acting nervous system depressant is suspected. Which of the following is the most likely finding on the initial blood gas?

A. Chronic hypercapnic respiratory failure only
B. Acute hypoxemic respiratory failure only
C. Mixed hypoxemic and hypercapnic respiratory failure
D. Acute hypercapnic respiratory failure only