In theory, how does positive expiratory pressure (PEP) help to move secretions into the larger airways?
1. Filling underaerated segments through collateral ventilation
2. Preventing airway collapse during expiration
3. Causing bronchodilation during inspiration
a. 2 and 3 only
b. 1 and 2 only
c. 1, 2, and 3
d. 1 and 3 only
ANS: B
In theory, PEP helps move secretions into the larger airways by (1) filling underaerated or no-naerated segments via collateral ventilation and (2) preventing airway collapse during expiration.
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