A nurse is assigned to care for four patients. Which patient should the nurse assess first?

Patient prioritization relies on the Airway-Breathing-Circulation (ABC) framework to identify life-threatening physiological instability. Tachypnea and dyspnea indicate potential hypoxemia or respiratory failure, necessitating immediate intervention to prevent cardiac arrest. This approach ensures that the most hemodynamically compromised patients receive urgent clinical evaluation to maintain vital organ perfusion and oxygenation. Rationale: A. A blood pressure of 140/90 mmHg represents Stage 2 hypertension but does not constitute a hypertensive crisis. A mild headache is a common finding that does not suggest immediate neurological compromise. This patient is hemodynamically stable and does not take priority over a patient with acute respiratory distress. B. a temperature of 100.4 F (38 C) on the first postoperative day is a frequent finding, often related to atelectasis or the inflammatory response to surgery. While it requires monitoring, it is not an acute emergency. Encouraging deep breathing and incentive spirometry is appropriate, but respiratory stability remains the higher priority. C. A respiratory rate of 28 breaths per minute combined with subjective shortness of breath indicates respiratory distress. This requires immediate assessment of oxygen saturation and lung sounds to rule out pulmonary embolism or pneumonia. According to ABC priorities, breathing concerns must be addressed before pain or mild vital sign deviations. D. A pain level of 8 out of 10 is significant and requires timely pharmacological intervention for comfort and recovery. However, pain is considered a psychosocial or "level 2" priority compared to the "level 1" status of respiratory compromise. The nurse must stabilize the patient who has difficulty breathing before administering analgesics to others.