The nurse admits an older adult who had abdominal surgery. Admission vital signs are heart rate (pulse) (P), 73 beats per minute (bpm); respiration rate (R), 20 breaths per minute; blood pressure (BP), 136/84 mm Hg. He is receiving intravenous (IV) fluids but has not requested pain medication since surgery. Seven hours later, his vital signs are P, 98 bpm; R, 26 breaths per minute, and BP, 164/90 mm Hg and he denies pain. Which intervention should the nurse implement?