问题
单项选择题
The physician orders supplemental oxygen for a client with a respiratory problem. To provide the highest possible oxygen concentration, the nurse expects to use which oxygen delivery device
A．Nasal cannula.
B．Venturi mask.
C．Partial rebreathing mask.
D．Nonrebreathing mask.
答案
参考答案：D
解析：A nonrebreathing mask provides the highest possible oxygen concentration--up to 95%. A nasal cannula doesn't deliver concentrations above 40%. A Venturi mask delivers precise concentrations of 24% to 44%, regardless of the client's respiratory pattern, because the same amount of room air always enters the mask opening. A partial rebreathing mask delivers oxygen concentrations up to 90%.