One hour after arriving on the postoperative unit, a woman who received spinal anesthesia 5 hours ago is complaining of severe abdominal incisional pain. Her vital signs are: temperature 99° F (37.2° C), heart rate 110 beats/minute, respiratory rate 30 breaths/minute and blood pressure 160/90 mmHg. The client's skin is pale, and the surgical dressing is dry and Intact. Which intervention is most important for the nurse to Implement?