After a client receives an IM injection, he complains of burning pain in the injection site. Which nursing action would be the best to take at this time（）
A. Apply a cold compress to decrease swelling.
B. Apply a warm compress to dilate the blood vessels.
C. Massage the area to promote absorption of the drug.
D. Instruct the client to tighten his gluteal muscles to promote better absorption.
参考答案：B
解析：
Applying heat increases blood flow to the area, which, in turn, increases the absorption of the medication. Cold decreases the pain but allows the medication to stay in the muscle longer. Massage is a good intervention but applying a warm compress is better. Tightening the gluteal muscles may cause additional burning if the drug irritates muscular tissues.