Explanation

Anxiety related to the upcoming surgery is the most appropriate nursing diagnosis for the preoperative period. Many clients experience fear and anxiety before a major surgery like a prostatectomy. Addressing the client's emotional needs and providing reassurance and education are key nursing interventions.

Risk for impaired skin integrity is more relevant in the postoperative period, when the client is at risk for pressure ulcers due to immobility. Deficient knowledge about postoperative care should be addressed preoperatively, but it is not the most immediate concern. Impaired urinary elimination is an expected outcome after prostatectomy, but it is not the focus in the preoperative phase.