The nurse is caring for a client on the medical step-down unit. Which of the following assessment data requires immediate nursing action? (Select all that apply.)

Choice A reason: New onset of respiratory stridor indicates acute upper airway obstruction. Stridor is a high-pitched sound caused by turbulent airflow through a narrowed airway. This is a medical emergency because airway compromise can rapidly progress to respiratory failure. Immediate intervention is required to secure the airway and prevent hypoxia. Choice B reason: Shortness of breath persisting for 20 minutes suggests significant respiratory distress. Prolonged dyspnea indicates impaired oxygenation or ventilation, which can quickly deteriorate if not addressed. This symptom requires immediate nursing action to assess oxygen saturation, provide supplemental oxygen, and notify the provider. Choice C reason: A blood pressure of 150/84 is mildly elevated but not immediately life-threatening. Hypertension at this level does not require urgent intervention in the absence of other critical symptoms. It should be monitored and managed, but it does not demand immediate action compared to airway or severe acid-base disturbances. Choice D reason: Nervousness associated with anxiety is not an urgent clinical finding. While anxiety can affect patient comfort and may exacerbate symptoms, it does not represent a life-threatening condition requiring immediate intervention. Supportive measures can be provided after stabilizing critical issues. Choice E reason: ABG results showing pH 7.12, PaCO2 28 mmHg, and PaO2 55 mmHg indicate severe metabolic acidosis with hypoxemia. A pH of 7.12 reflects life-threatening acidemia, while PaO2 of 55 mmHg shows inadequate oxygenation. This combination requires immediate intervention to correct oxygenation and acid-base balance, as it can lead to cardiovascular collapse and multi-organ dysfunction if untreated.