The "sigmoid" shape of the static pressure-volume lung recruitment maneuver indicates which of the following?
a. All parts of the lungs open with the same pressure.
b. Independent portions of the lungs open with the same pressure.
c. Dependent portions of the lungs open with different pressures.
d. Lung units open at different times with different pressures.
ANS: D
The shape of the pressure-volume curve suggests that different areas of the lung open at different pressures during the recruitment maneuver. As pressure is exerted every few seconds, different areas of the lungs are recruited. This occurs between the lower inflection point on the inspiratory limb up to the upper inflection point on the inspiratory limb.
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