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10 Cards in this Set

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  • Back
If lungs are removed from the chest, chestwall will... Why?
expand; chest wall has inherit outward force, counterbalanced by lung recoil.
T/F at FRC inward recoil of the lung is slightly greater than outward recoil of chestwall.
F. At FRC they are exactly counter balanced.
Volume of conducting airways is?
dead space; 150mls
T/F O2 and CO2 equilibration occurs in .25secs.
T 1/3 of the availible time
At 60torr O2 is what percentage saturated
90%
3 causes of AaDO2 (or A/a mismatch)
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)
4 mechanisms of hypoxemia:
1. Shunt
2. V/Q mismatch
3. Hypoventilation
4. Low inspired PO2
High PCO2 w/ Hypoxemia indicates what Dz?
emphazema, secondary to dystruction of surface area for gas diffusion.
What type of breath sounds are produced by consolidated lungs? How?
bronchial breath sounds; transmit sounds better than ventilated lungs.
What are lung crackles? Indicated in what Dz.
Crackles (or rales)phonate secondary to the opening of collaped alveoli; heard on late inspiration or through out. Eg. Pulmonary Edema; Pneumonia