Problem: A 25-year-old man is noted to have a blood pressure of 61/52 mm Hg on the evening after laparotomy and small bowel resection for strangulated small bowel obstruction. His heart rate is 112 beats per minute, respiratory rate is 24 breaths per minute, and temperature is 37.4 °C (99.3 °F); urine output is 20 mL over 2 hours, and oxygen saturation by pulse oximeter is 95%. His preoperative serum hemoglobin value was 12.6 g/dL, and the hemoglobin obtained in the recovery room is 11.8 g/dL. Which of the following findings is most significant regarding the care of this patient? a. Recovery room hemoglobin b. Oxygen saturation level c. History of anxiety d. Mean arterial pressure