A patient is on room air. Their arterial CO2 is 60 mmHg, and the respiratory quotient is 0.8. Which of these is the closest estimated alveolar oxygen pressure?, 90, 65, 45, 30, Two patients are breathing room air at sea level. Patient A: PaCO₂ = 40 mmHg, Patient B: PaCO₂ = 60 mmHg. Assume both patients have the same inspired oxygen pressure and a respiratory quotient of 0.8. Which statement best describes the expected effect of the higher PaCO₂ in Patient B?, Patient B will have a higher alveolar oxygen pressure because carbon dioxide contributes to oxygen diffusion, Patient B will have a lower alveolar oxygen pressure because the increased carbon dioxide term reduces the calculated alveolar oxygen pressure., A critically ill patient has a calculated physiologic shunt fraction of 35%. Despite receiving supplemental oxygen, the patient's arterial oxygenation remains significantly impaired. Which interpretation is most accurate?, A shunt fraction of 35% means that 35% of the alveoli are functioning normally and that hypoxemia should resolve immediately with supplemental oxygen., A shunt fraction of 35% means that 35% of the blood bypasses effective alveolar gas exchange, potentially contributing to severe hypoxemia and a limited response to supplemental oxygen.

quiz 2

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