A 63-Year-Old Man Undergoes a Sleep Study, During Which He

A 63-year-old man undergoes a sleep study, during which he is closely observed for a full night.  Several physiologic parameters, such as oxygen saturation, heart rhythm, cerebral electrical activity, respiratory airflow, and movements of the chest and upper abdominal walls, are continuously recorded.  The following graph depicts a recording obtained over a period of 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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