A nurse is planning to assess a group of four postoperative clients. Which of the following clients should the nurse assess first?

The client with an increased heart rate and dropped blood pressure must be assessed first because these findings together are classic early signs of hemorrhagic shock or other hemodynamic instability, which can rapidly progress to cardiovascular collapse and death. Compensatory tachycardia and hypotension in a postoperative client suggest significant internal bleeding, sepsis, or another immediately life-threatening complication. Using the ABCs and Maslow's hierarchy, circulatory compromise is always the highest priority. The client with persistent nausea despite antiemetic medication is uncomfortable and needs reassessment but is not in immediate danger. The client reporting a pain level of 8 out of 10 is experiencing significant discomfort; however, acute pain in the immediate postoperative period, while important, does not represent the same immediate threat to life as hemodynamic instability. The client with urine output averaging 32 mL per hour is below the acceptable threshold of 30 mL per hour but the output is just above critical, and while concerning for decreased renal perfusion, this situation is less immediately life-threatening than the deteriorating hemodynamics of the first client.