A 63-Year-Old Man Is Subjected to a Sleep Study in Which

A 63-year-old man is subjected to a sleep study in which he is closely monitored for the duration of the night. Several physiologic parameters are continuously recorded, including oxygen saturation, heart rhythm, cerebral electrical activity, respiratory airflow, and movements of the chest and upper abdominal walls. The graph below depicts a recording obtained over several minutes: Which of the following is the most likely cause of the observed findings?

A) Advanced heart failure
B) Diffuse lung fibrosis
C) Neuromuscular weakness
D) Severe ketoacidosis
E) Upper airway obstruction

Correct Answer:

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