Which of the following will cause an increase in the pressure energy required for inspiration? 1. Increased compliance 2. Increased flow 3. Increased resistance 4. Increased volume
a. 1 and 2 only
b. 2 and 4 only
c. 2, 3, and 4 only
d. 1, 2, 3, and 4
ANS: C
High flows and increased Raw increase frictional work. Large tidal volumes increase the elastic component of work. Increased compliance will decrease the elastic component of work and thus is the one exception to an increased energy demand.
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