Which of the following are true about continuous positive airway pressure (CPAP)?
1. It maintains alveoli at greater inflation volumes.
2. It holds airway pressure essentially constant.
3. It provides the pressure gradient needed for ventilation.
4. It has side effects similar to those of positive pressure ventilation.
a. 1 and 3 only
b. 1, 2, and 4 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: B
Because airway pressure does not change, CPAP does not provide ventilation.
Health Professions
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