Created at 3:28 a.m. Dec, 12, 2025
Author:
mgujju
Type of change:
Content error
Rationale for change
The current card contains incorrect or misleading information that conflicts with standard physiology. V/Q mismatch does improve with 100% oxygen, whereas true intrapulmonary shunt does not. The card should be corrected to accurately reflect the distinction between V/Q mismatch and shunt physiology.
Does 100% O₂ improve PaO₂ in a true intrapulmonary shunt?
Answer: No.
Current
Suggested
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- Important distinguishing feature of shunting (e.g., pneumonia, pulmonary edema, atelectasis, pAVMs) vs. other causes of hypoxemia
Reasoning:
- Adding 100% will improve the right side, but the left side is still < 99% and they will eventually mix, causing hypoxemia
- Compare with V/Q mismatch (e.g., secondary to PE or COPD), which does improve with oxygen 100% — there isn't mixing with the deoxygenated blood on the left side
Lecture Notes
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Missed Questions
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Pathoma
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Boards and Beyond
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First Aid
Sketchy
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Sketchy 2



Watch Hypoxemia DDx



Watch Hypoxemia DDx
Sketchy Extra
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Picmonic
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Pixorize
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Physeo
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OME
Additional Resources
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