Pulmonary 5: Diffusion and Perfusion Flashcards Preview

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Flashcards in Pulmonary 5: Diffusion and Perfusion Deck (31)
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31

How does hypoxia affect PVR?
How do high levels of O2 affect PVR?

Isolated, local hypoxia does not alter PVR; approximately
20% of the vessels need to be hypoxic before a change
in PVR can be measured. Low inspired O2 levels as a
result of exposure to high altitude will have a greater
effect on PVR because all vessels are affected. High
levels of inspired O2 can dilate pulmonary vessels and
decrease PVR.