A nurse is caring for a 58-year-old patient diagnosed with COPD exacerbation who is experiencing increasing dyspnea and oxygen saturation of 85% on room air. Which nursing intervention should be the priority?

Clinical Context & Priority Setting
In a patient with a known COPD exacerbation presenting with increasing dyspnea and an oxygen saturation of 85% on room air, the immediate physiological threat is severe hypoxemia. The nursing priority must align with the Airway, Breathing, Circulation (ABC) framework. While bronchodilators and breathing exercises are core components of COPD management, they address the underlying bronchoconstriction and ventilation pattern, which take time to effect change. The most time-sensitive need is to correct the critical oxygen deficit to prevent end-organ damage, making the initiation of supplemental oxygen the first and most urgent independent nursing action.

Pathophysiology & Rationale for Priority
The initial assessment of respiratory distress, as outlined in emergency medicine guidelines, emphasizes the immediate recognition and management of life-threatening hypoxemia ^[1]. In a COPD exacerbation, alveolar hypoventilation and ventilation-perfusion mismatch lead to a rapid decline in arterial oxygen content. An SpO₂ of 85% corresponds to a PaO₂ of approximately 50-55 mmHg, which is on the steep slope of the oxyhemoglobin dissociation curve. At this point, any further small decrease in ventilation can cause a precipitous drop in oxygen saturation and cardiac arrest. Initiating oxygen therapy directly and immediately increases the fraction of inspired oxygen, improving alveolar oxygen tension and rapidly stabilizing the patient's condition.

Analysis of Other Options

Option	Why It Is Not the Priority
1. Administer bronchodilators as prescribed	Bronchodilators reduce airway resistance and improve airflow but do not directly address the critical, immediate hypoxemia. Their onset of action, even when rapid, is slower than the direct provision of oxygen. Furthermore, the administration of a prescribed medication is a dependent nursing intervention that follows the initial stabilization of the ABCs.
2. Encourage deep breathing and coughing exercises	These techniques are beneficial for secretion clearance and preventing atelectasis in a stable patient. However, a patient in acute, severe respiratory distress with an SpO₂ of 85% is often too dyspneic and fatigued to perform these exercises effectively. Forcing this intervention before correcting hypoxemia can increase oxygen consumption and worsen distress.
4. Position the patient in Trendelenburg position	The Trendelenburg position (head lower than feet) is contraindicated in respiratory distress. It forces the abdominal contents against the diaphragm, restricting lung expansion and further compromising ventilation. The appropriate position is high-Fowler's or an upright tripod position to maximize chest wall expansion and diaphragmatic excursion.

Evidence-Based Clinical Application
The formalized expert recommendations for the initial assessment of respiratory distress in the emergency setting provide a structured framework that is directly applicable to the bedside nurse ^[1]. The guideline's emphasis on a systematic initial assessment supports the ABC approach, where the "B" for breathing includes the immediate identification and correction of hypoxemia. For the NCLEX-RN examinee, this translates to recognizing that in any scenario where a patient has a patent airway but a critically low oxygen saturation, the application of oxygen is the first and most critical independent nursing intervention. Once the patient's oxygenation is stabilized, the nurse can then proceed with other collaborative interventions, such as administering prescribed bronchodilators and positioning the patient for optimal ventilation.