Spinal anesthesia

A patient who received spinal anesthesia four hours ago during surgery is transferred to the surgical unit and, after one and a half hours, now reports severe incisional pain. The patient’s blood pressure is 170/90 mm Hg, pulse is 108 beats/min, temperature is 99oF (37.2oC), and respirations are 30 breaths/min. The patient’s skin is pale, and the surgical dressing is dry and intact. The most appropriate nursing intervention is to: