Final answer:
The nurse should anticipate an order for a return flow enema to assist the postoperative patient experiencing abdominal distention and difficulty expelling flatus.
Step-by-step explanation:
A postoperative patient experiencing abdominal distention and having difficulty expelling flatus is likely to benefit from a return flow enema, also known as a Harris flush. This procedure helps to expel gas and relieve bloating. A cleansing enema could be considered if constipation is also a concern, but it is primarily targeted at removing feces. Medicated enemas are used to deliver medication to the rectum, which seems unnecessary in this case. A retention enema is used to introduce a solution into the colon that is meant to be retained for a prolonged period, which could exacerbate distention. Therefore, the nurse should anticipate receiving an order to perform a return flow enema from the provider.