A nurse is contributing to the plan of care for a client who is postoperative following peritoneal lavage for peritonitis. The client has a nasogastric tube to low-intermittent suction and closed-suction drains in place. Which of the following interventions should the nurse include in the plan?

The correct answer is C: Place the client in a high Fowler's position. Placing the client in a high Fowler's position helps promote drainage and prevents complications such as aspiration. This position increases lung expansion and aids in the movement of fluid through the peritoneal cavity. Irrigating the nasogastric tube with tap water (Choice A) is not recommended as it can cause electrolyte imbalances. Marking abdominal girth once daily (Choice B) may not be necessary unless there are specific concerns about abdominal distension. Ambulating the client twice daily (Choice D) is beneficial but does not directly address the postoperative care needs related to the peritoneal lavage.