V/Q mismatch in ARDS — Flashcards

Flashcard 1: What type of V/Q mismatch occurs due to airway obstruction? _____

Answer: Shunt (perfusion but no ventilation)

Flashcard 2: Does **100% O2** improve PaO2 in **V/Q mismatch**?

Answer: Yes (unlike in a shunt)

Flashcard 3: Rank the following variables for zone 3 of the lung: PA, Pa, and Pv _____

Answer: Pa > Pv > PA

Flashcard 4: Increased VA/Q results in _____

Answer: alveolar dead space

Flashcard 5: Both ventilation and perfusion are _____ at the base of the lung than at the apex of the lung

Answer: greater

Flashcard 6: In zone _____ of the lung, high alveolar pressure may compress the capillaries and reduce blood flow in this zone

Answer: 1

Flashcard 7: _____ is ventilation of lung regions that are not perfused (V/Q = _____).

Answer: Dead space (V/Q = \u221e)

Extra: Dead space occurs when ventilation (V) is present but perfusion (Q) is zero. V/Q = V/0 = \u221e (infinity). A classic clinical example is a pulmonary embolism.

Flashcard 8: Can normal aging cause a ventilation/perfusion mismatch?_____

Answer: Yes

Flashcard 9: The _____ ratio is the ratio of alveolar ventilation to pulmonary blood flow

Answer: ventilation/perfusion (V/Q)

Flashcard 10: _____ 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