单项选择题

A client has sustained a right tibial fracture and has just had a cast applied. Which instruction should the nurse provide in his cast care（）

A. Cover the cast with a blanket until the cast dries.
B. Keep your right leg elevated above heart level.
C. Use a knitting needle to scratch itches inside the cast.
D. A foul smell from the cast is normal.

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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.

单项选择题A client hospitalized with a pneumothorax has the following arterial blood gas (ABG) analysis: pH, 7.19; partial pressure of arterial carbon dioxide (PaCO2), 63 mmHg; and,22 mEq L. A chest tube was inserted and oxygen administered at 4 L min by nasal cannula. One hour after the initiation of treatment, ABG analysis reveals: pH, 7.28; PaCO2, 52 mmHg; and ,22 mEq L. This change in ABG analysis indicates（）

A. respiratory alkalosis.
B. impending respiratory arrest.
C. the need for intubation.
D. improved respiratory status.