After striking his head on a tree while falling from a ladder, a young man is admitted to the emergency department. He’s unconscious and his pupils are nonreactive. Which intervention would be the most dangerous for the client（）
A. Give him a barbiturate.
B. Place him on mechanical ventilation.
C. Perform a lumbar puncture.
D. Elevate the head of his bed.
参考答案：C
解析：
The client’s history and assessment suggest that he may have increased intracranial pressure (ICP). If this is the case, lumbar puncture shouldn’t be done because it can quickly decompress the central nervous system and, thereby, cause additional damage. After a head injury, barbiturates may be given to prevent seizures; mechanical ventilation may be required if breathing deteriorates; and elevating the head of the bed may be used to reduce ICP.