Which of the following O2 devices is appropriate for

a. Simple mask c. Partial rebreathing mask
b. Nasal cannula d. Air-entrainment mask

ANS: D
Air-entrainment masks are excellent for providing oxygen therapy to hypoxemic patients with chronic obstructive pulmonary disease who typically require a fixed FIO2 between 0.24 and 0.35. The total flow of gas delivered (oxygen plus air) by such masks for lower FIO2 levels is usually sufficient to meet the peak inspiratory flow requirements for these patients.