A nurse is caring for a client who is receiving continuous bladder irrigation following a transurethral resection of the prostate. The client reports bladder spasms and the nurse observes decreased urinary output. Which of the following actions should the nurse take?

A. Decrease traction on the catheter: Traction is applied to maintain pressure on the prostatic fossa after surgery and should not be adjusted without provider instruction. Reducing traction does not address the cause of bladder spasms or decreased output, which is most often related to catheter obstruction from clots. B. Remove the indwelling urinary catheter: Removing the catheter is not appropriate because it interrupts continuous bladder irrigation and can worsen bleeding. Catheter removal should only occur under provider direction, especially in the early postoperative period when clot formation is common. C. Administer ibuprofen 400 mg for pain relief: Ibuprofen may help relieve discomfort, but it does not correct the cause of bladder spasms or low urinary output. Pain control alone is inadequate when obstruction is suspected, and relying on analgesics may delay necessary interventions. D. Flush the catheter manually with 0.9% sodium chloride: Manual irrigation helps clear clots that can obstruct the catheter, restoring urinary flow and relieving bladder spasms. This is the most appropriate intervention when output suddenly decreases during continuous bladder irrigation, as obstruction is a common postoperative complication.