Final answer:
The appropriate nursing action would be to measure ureteral urinary drainage every 1 to 2 hours.
Step-by-step explanation:
When caring for a patient after a lithotripsy procedure with a right ureteral catheter placed, the appropriate nursing action would be to measure ureteral urinary drainage every 1 to 2 hours. This is important to monitor the output and ensure that the catheter is functioning properly. Stripping or milking the catheter is not recommended as it can cause trauma to the urinary tract. Irrigating the catheter with sterile saline is not necessary unless there are specific indications for it. Encouraging ambulation may promote urinary peristaltic action but it is not specifically related to the care of the catheter.