A client is admitted to the emergency department with a suspected overdose of an unknown drug. The client’s arterial blood gas values indicate respiratory acidosis. What should the nurse do first（）
A. Prepare to assist with ventilation.
B. Monitor the client’s heart rhythm.
C. Prepare to begin gastric lavage.
D. Obtain urine for drug screening.
参考答案：A
解析：
Respiratory acidosis is associated with hypoventilation, which in this client suggests intake of a drug that suppresses the brain’s respiratory center. Therefore, the nurse should assume the client has respiratory depression and should prepare to assist with ventilation. After the client’s respiratory function has been stabilized, the nurse can safely monitor the heart rhythm, prepare for gastric lavage, and obtain a urine sample for drug screening.