A 68-year-old woman underwent hip surgery two days ago for osteoarthritis. She is using oxycodone for pain relief. She has no other past medical history. Cardiopulmonary examination is unremarkable. Her pulse oximeter reads 92%. Which of the following combinations of parameters is most likely in this patient?
↑ A-a gradient; ↑ pH; ↑ HCO3–
↑ A-a gradient; ↑ pH; ↓ HCO3–
↑ A-a gradient; ↑ pH; ↔ HCO3–
↑ A-a gradient; ↓ pH; ↑ HCO3–
↑ A-a gradient; ↓ pH; ↓ HCO3–
↑ A-a gradient; ↓ pH; ↔ HCO3–
↔ A-a gradient; ↑ pH; ↑ HCO3–
↔ A-a gradient; ↑ pH; ↓ HCO3–
↔ A-a gradient; ↑ pH; ↔ HCO3–
↔ A-a gradient; ↓ pH; ↑ HCO3–
↔ A-a gradient; ↓ pH; ↓ HCO3–
↔ A-a gradient; ↓ pH; ↔ HCO3–
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Cut-to-the-chase Answer (0:43):
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HY USMLE Answer (2:20):
