During an initial postoperative assessment in the PACU, which factor should the nurse prioritize?

A. Patent airway and adequate breathing: Respiratory stability is the highest priority in the Post-Anesthesia Care Unit (PACU) due to the depressant effects of anesthetic agents. Airway obstruction or hypoventilation can lead to rapid hypoxemia and cardiac arrest. This aligns with the fundamental ABC (Airway, Breathing, Circulation) priority-setting framework in nursing. B. Blood pressure readings: Monitoring hemodynamic stability is a critical component of PACU care, but it follows the assessment of the airway. While hypotension can indicate hemorrhage, oxygenation must be secured first to ensure organ perfusion. Circulation is the third priority in the primary assessment survey. C. Nausea and vomiting control: Postoperative nausea and vomiting (PONV) are common and distressing but are rarely immediately life-threatening. Management of these symptoms occurs after the patient's ventilatory and circulatory statuses are deemed stable. They are secondary to the primary physiological needs of gas exchange. D. Pain assessment and management: Pain is a significant subjective finding that requires intervention to prevent sympathetic overactivity. However, high-dose analgesics can further depress the respiratory drive in a freshly anesthetized patient. Airway patency and breathing efficiency must be confirmed before aggressive pain management is initiated.