A 60-kg, 53-year-old man with no significant medical problems undergoes lysis of adhesions for a small-bowel obstruction. Postoperatively, he has high nasogastric output and low urine output. What is the most appropriate management of his fluids?
Infusion of D5 0.45% normal saline at 100 mL/h Infusion of D5 0.9% normal saline at 100 mL/h Infusion of D5 lactated Ringer at 100 mL/h Replacement of nasogastric tube losses with lactated Ringer in addition to maintenance fluids