Asthma USMLE Step 1 Practice Question
A 46-year-old woman with a body mass index of 43 kg per m2 has excessive daytime sleepiness, morning headaches, and exertional dyspnea. Arterial blood gas while awake shows PaO2 60 mm Hg and PaCO2 54 mm Hg. She snores loudly but also remains hypercapnic during the daytime. Which of the following is the most likely diagnosis?
Answer choices
- ACentral sleep apnea due to heart failure
- BObstructive sleep apnea alone
- CPrimary pulmonary hypertension
- DObesity hypoventilation syndromeCorrect answer
- EPanic disorder with hyperventilation
- FIdiopathic hypoventilation syndrome
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