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Review Question - QID 210592

Shunts Overview Right-to-left shunt QID: 210592 (M1.OMB.18.1)
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QID 210592 (Type "210592" in App Search)
A 21-year-old man presents to his physician because he has been feeling increasingly tired and short of breath at work. He has previously had these symptoms but cannot recall the diagnosis he was given. Chart review reveals the following results:

Oxygen tension in inspired air = 150 mmHg
Arterial carbon dioxide tension = 50 mmHg
Arterial oxygen tension = 71 mmHg
Respiratory exchange ratio = 0.80

Diffusion studies reveal normal diffusion distance. The patient is administered 100% oxygen but the patient's blood oxygen concentration does not improve. Which of the following conditions would best explain this patient's findings?
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