USMLE Step 2 Quiz
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PULMONOLOGY
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A 70-year-old woman with obesity hypoventilation syndrome presents with lethargy and dyspnea. Vitals: RR 8/min, SpO2 85% on room air. ABG: pH 7.30, PaCO2 60 mm Hg, PaO2 56 mm Hg, HCO3− 25 mEq/L. Chest X-ray shows low lung volumes. Potential causes of hypoxemia include hypoventilation, PE, pneumonia, and heart failure. What is the most likely diagnosis based on the clinical presentation?
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