Shunt physiology (low V/Q) — Flashcards

Flashcard 1: What type of V/Q mismatch occurs due to pulmonary embolus?_____

Answer: Dead space*

Flashcard 2: What is the ideal V/Q ratio for adequate gas exchange? _____

Answer: 1 (ventilation matches perfusion)

Flashcard 3: Decreasing VA/Q may be due to a _____ shunt

Answer: R to L

Flashcard 4: A defining characteristic of hypoxemia caused by a right-to-left shunt is that it _____ be corrected with high O2 gas

Answer: cannot

Flashcard 5: In a patient with a pulmonary emboli, V/Q lung scan shows mismatch due to abnormal _____

Answer: perfusion

Flashcard 6: Does 100% O2 improve PaO2 in V/Q mismatch due to shunt? _____

Answer: No

Flashcard 7: _____ is perfusion of lung regions that are not ventilated (V/Q = 0)

Answer: Shunt

Extra:  Watch associated Bootcamp video [https://app.bootcamp.com/med-school/pulmonology/videos/blood?index=8] https://onlinemeded.org?ref=anki 

Flashcard 8: The V/Q ratio at the base of the lung is normally _____, indicating wasted perfusion

Answer: 0.6

Extra:  Watch associated Bootcamp video [https://app.bootcamp.com/med-school/pulmonology/videos/blood?index=6] https://onlinemeded.org?ref=anki 

Flashcard 9: In zone _____ of the lung, high alveolar pressure may compress the capillaries and reduce blood flow in this zone

Answer: 1

Extra:  Watch associated Bootcamp video [https://app.bootcamp.com/med-school/pulmonology/videos/blood?index=6] https://onlinemeded.org?ref=anki 

Flashcard 10: In the lungs, hypoxia causes vaso-_____

Answer: constriction

Extra:  Watch associated Bootcamp video [https://app.bootcamp.com/med-school/pulmonology/videos/blood?index=4] https://onlinemeded.org/spa/pulmonology?ref=anki