Ventilation-perfusion matching — Flashcards

Flashcard 1: In normal health, O2 exhibits _____-limited gas exchange

Answer: perfusion

Flashcard 2: The alveolar gas equation states that the alveolar Po2 (PAo2) equals:_____

Answer: PAO2 = PIO2 – (PaCO2 / R)

Extra: PIO2 = inspired PO2; PaCO2 = arterial PCO2; R = respiratory quotient (usually 0.8).

Flashcard 3: _____ is the total volume of the lungs that does not participate in gas exchange

Answer: Physiologic dead space

Flashcard 4: In _____-limited gas exchange, the gas equilibrates early along the length of the capillary

Answer: perfusion

Flashcard 5: The lung diffusing capacity (DL) is the equivalent of _____ of the alveolar-pulmonary capillary barrier

Answer: permeability

Flashcard 6: What is the effect of increased alveolar ventilation on arteriolar (and alveolar) Pco2?_____

Answer: Decreased Pco2

Flashcard 7: What is the secondary regulator of cerebral perfusion?

Answer: PO2 - only takes effect during severe hypoxia

Flashcard 8: What is the primary regulator of cerebral perfusion?

Answer: PCO2

Flashcard 9: How long can the brain withstand hypoxia before sustaining irreversible damage?

Answer: 5 minutes

Flashcard 10: In the _____, HCO3- enters the red blood cells in exchange for Cl-

Answer: lungs

Extra:  Watch associated Bootcamp video [https://app.bootcamp.com/med-school/pulmonology/videos/blood?index=12] https://onlinemeded.org?ref=anki