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In the estimation of cardiac output using the Fick principle A. Pulmonary blood flow is measured. B. The PO2 of arterial and mixed venous blood are measured. C. Oxygen uptake is estimated from alveolar PO2 measurements. D. Pulmonary arterial blood is sampled to measure the oxygen in mixed venous blood. E. Pulmonary venous blood is sampled to measure the oxygen in arterial blood. |
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Answer» A. True Pulmonary blood flo = right ventricular output = cardiac output. B. False The O2 content of arterial and mixed venous blood are measured. C. False To measure O2 consumption, the subject breathes from a spirometer filled with oxygen with a CO2 absorber in the circuit; an open circuit method may also be used. D. True The pulmonary artery is relatively easy to catheterize and the venous blood it contains is thoroughly mixed. E. False Pulmonary veins are difficult to catheterize. Blood from any artery may be used since the O2 content of peripheral arterial blood is the same as that in the pulmonary vein. |
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