Which of the following would you expect to occur if perfusion to an area of the lung remained constant, but V_A to this same area decreased?

Question

Quizplus · Accepted Answer

If perfusion to an area of the lung remains constant but ventilation to the same area decreases (i.e. V_A), this would create a ventilation-perfusion mismatch leading to decreased oxygenation of blood in that area of the lung. This would result in a decrease in the PAO2 (partial pressure of oxygen in arterial blood), leading to a decrease in the PaO2 (partial pressure of oxygen in the blood). Therefore, the correct option is C, as the PAO2 should fall. Option A is incorrect because PACO2 (partial pressure of carbon dioxide in arterial blood) would not change in this scenario. Option B is incorrect because it refers to the hemodynamic response, which is not applicable to this scenario. Option D is incorrect because the ventilation-perfusion ratio (V/Q) would decrease.

Which of the Following Would You Expect to Occur If V˙\dot { V }V˙

Which of the Following Would You Expect to Occur If $\dot { V }$