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10 Cards in this Set
- Front
- Back
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If lungs are removed from the chest, chestwall will... Why?
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expand; chest wall has inherit outward force, counterbalanced by lung recoil.
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T/F at FRC inward recoil of the lung is slightly greater than outward recoil of chestwall.
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F. At FRC they are exactly counter balanced.
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Volume of conducting airways is?
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dead space; 150mls
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T/F O2 and CO2 equilibration occurs in .25secs.
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T 1/3 of the availible time
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At 60torr O2 is what percentage saturated
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90%
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3 causes of AaDO2 (or A/a mismatch)
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1. Shunt-
a. cardiac lesion (R to L heart shunt) b. lung structural defect that result in direct communication b/w arterial/venous blood. c. pulmonary edema- complete filling of aveolar sacs or collapse 2. V/Q mismatch 3. Diffusion Block (hypothetical) |
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4 mechanisms of hypoxemia:
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1. Shunt
2. V/Q mismatch 3. Hypoventilation 4. Low inspired PO2 |
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High PCO2 w/ Hypoxemia indicates what Dz?
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emphazema, secondary to dystruction of surface area for gas diffusion.
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What type of breath sounds are produced by consolidated lungs? How?
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bronchial breath sounds; transmit sounds better than ventilated lungs.
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What are lung crackles? Indicated in what Dz.
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Crackles (or rales)phonate secondary to the opening of collaped alveoli; heard on late inspiration or through out. Eg. Pulmonary Edema; Pneumonia
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