A nurse has just received morning change-of-shift report for four clients. Which of the following clients should the nurse attend to first?

The scenario requires prioritization of four postoperative or stable medical clients using clinical frameworks. Knowledge of the airway, breathing, circulation hierarchy and recognizing signs of acute organ failure, such as severe oliguria, must be applied. Choice A rationale A pain score of 3 out of 10 two days after abdominal surgery indicates mild, controlled pain. This is an expected finding that does not indicate acute, life-threatening complications, making this client stable. Choice B rationale Intermittent nausea is a common, expected side effect of anesthesia and sedation one hour following an extracorporeal shock wave lithotripsy procedure. It is non-emergent and managed effectively with standard as-needed antiemetic medications. Choice C rationale A total output of 30 mL over 4 hours averages less than 8 mL/hr, falling significantly below the normal minimum of 30 mL/hr. This severe oliguria indicates potential acute kidney injury or urinary tract obstruction. Choice D rationale A potassium level of 5 mEq/L is at the upper limit of the normal range of 3.5 to 5.0 mEq/L. Because dialysis is already scheduled for the afternoon, this stable metabolic state requires no immediate emergency intervention.