Beneficial physiological effects of positive end expiratory pressure (PEEP) include which of the following?
1. Increased PaO2 for given FiO2
2. Increased lung compliance (CL)
3. Decreased shunt fraction
4. Increased functional residual capacity
a. 1, 2, 3, and 4
b. 3 and 4 only
c. 2, 3, and 4 only
d. 2 and 4 only
ANS: A
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