Which of the following modes of lung expansion therapy is physiologically most normal?
a. Continuous positive airway pressure
b. Incentive spirometry
c. Positive end expiratory pressure
d. Intermittent positive-pressure breathing therapy
ANS: B
Although all these approaches are used in lung expansion therapy, it should be clear that those methods that decrease Ppl (e.g., incentive spirometry) have more of a physiologic effect than those that raise Palv and often are most effective.
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