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3 Cards in this Set
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What is Hypoxic Vasoconstriction (HPV)?
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A Reflex intrapulmonary feedback mechanism in inhomogeneous lungs to improve gas exchange and arterial oxygenation.
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What is the difference between central hypoxemia and pulmonary hypoxemia?
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In central hypoxemia vasodilation occurs in the general circulation it has the opposite effect on pulmonary arteries.
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What efffect does HPV have on one-lung ventilation?
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HPV:
1. decreases the cardiac output to the nonventilated lung from 40% (lateral position) to 20% to 25%. 2. Shunt flow increases from 10% to 27% 3. PaO2 decreases from >400mmHg to <200 mmHg |
