An advantage to using a device that provides continuous positive airway pressure for respiratory disorders is that:

a. Oxygen concentrations can be closely controlled in patients with COPD
b. It can replace intubation in a patient who has lost the ability to maintain his airway
c. Lower liter flows of oxygen are required when using these devices
d. These devices keep the alveoli inflated resulting in improved lung efficiency

d
Rationale: a. This answer best describes a venture mask.
b. Intubation is the best choice when a patient can not protect or maintain their airway.
c. Incorrect.
d. Correct.