The post anesthesia care unit (PACU) charge nurse notes vital signs on four postoperative clients. Which client would the nurse assess first?

A. Client with a pulse of 118 beats/min: Tachycardia in the postoperative period can indicate pain, hypovolemia, anxiety, or early hypoxia. While it requires assessment, a heart rate of 118 bpm is a compensatory response and not immediately life-threatening compared to severe respiratory compromise. B. Client with a blood pressure of 90/50 mm Hg.: Hypotension may suggest hypovolemia, bleeding, or effects of anesthesia, and it requires prompt evaluation. However, mild to moderate hypotension can still allow for adequate perfusion temporarily, and it is less immediately critical than a severely depressed respiratory rate. C. Client with a temperature of 96 F (35.6 C): Mild hypothermia is common in the PACU due to anesthesia-induced vasodilation and impaired thermoregulation. While it can lead to complications such as shivering and increased oxygen demand, it is not immediately life-threatening and can be managed with warming measures. D. Client with a respiratory rate of 6 breaths/min: A respiratory rate of 6 indicates severe respiratory depression, most commonly due to residual anesthetics or opioid effects. This places the client at high risk for hypoventilation, hypercapnia, hypoxia, and potential respiratory arrest. Airway and breathing take priority, making this the most urgent client to assess.