A patient with chronic bronchitis comes to your emergency department; she is discovered to have a pulse oximetry oxygen saturation (SpO2) of 78% with room air. On the basis of these data, which oxygen-delivery device would you use with the patient?

a. 6-L nasal cannula c. Simple mask
b. Transtracheal cath-eter d. Venturi mask

ANS: D
A patient with chronic obstructive pulmonary disease requires a precise FIO2 because of carbon dioxide (CO2) retention issues. The only precise FIO2 device is a Venturi mask, which is consid-ered a high-flow device.