A nurse is caring for a 68-year-old patient with chronic obstructive pulmonary disease (COPD) who is receiving continuous oxygen therapy at 2 L/min via nasal cannula. The patient's oxygen saturation has dropped from 92% to 88% over the past hour, and the patient appears increasingly restless and confused. What is the most appropriate nursing intervention?

In COPD patients with declining O2 saturation and neurological changes, prioritize assessment of airway, positioning, and equipment before notifying the physician to prevent CO2 narcosis. Other options risk harm without proper evaluation.

Clinical Reasoning and Priority Setting

This scenario describes a patient with COPD on controlled oxygen therapy who is exhibiting a declining oxygen saturation alongside new-onset restlessness and confusion. In the hierarchy of nursing priorities, a change in mental status combined with physiological deterioration signals a potential life-threatening complication, such as worsening hypoxemia or hypercapnia. The most critical initial step is a focused assessment to identify and mitigate any immediately reversible causes before escalating interventions.

Analysis of the Correct Answer (Option 3)
The priority is to assess airway patency and positioning, then notify the physician. In a patient with COPD, a sudden drop in oxygen saturation and altered mental status can be caused by mucus plugging, a displaced oxygen cannula, or the onset of acute respiratory failure. A study on emergency nurses' knowledge, attitudes, and practices regarding oxygen therapy highlights that foundational clinical practices—such as ensuring a patent airway and proper patient positioning—are critical components of safe oxygen management ^[1]. The nurse must first check for any obstruction, ensure the head of the bed is elevated to optimize ventilation, and verify that the oxygen delivery device is functioning correctly. Following this rapid bedside assessment, the physician must be notified immediately because the patient's declining condition likely requires advanced interventions, such as arterial blood gas analysis or non-invasive ventilation, which are beyond the independent scope of nursing practice.

Why the Other Options Are Incorrect

- Option 1: Increase oxygen flow rate to 6 L/min immediately. This action is dangerous without a specific order. In COPD patients with chronic carbon dioxide retention, the hypoxic drive may be their primary stimulus to breathe. Administering high-flow oxygen can suppress this drive, leading to hypoventilation, worsening hypercapnia, and respiratory acidosis. The referenced study underscores that safe practice in oxygen therapy requires adherence to prescribed flow rates and careful titration based on target saturation ranges, not abrupt, unmonitored increases ^[1].

- Option 2: Administer prescribed bronchodilator medication. While bronchodilators are a cornerstone of COPD management for relieving bronchospasm, administering one should not be the first action. The immediate priority is to assess for an acute obstruction (e.g., a mucus plug) that would render an inhaled medication ineffective. Furthermore, the new onset of confusion necessitates a rapid evaluation for hypercapnia before giving additional therapies. Assessment always precedes intervention in the nursing process.

- Option 4: Encourage deep breathing exercises and coughing. This is an appropriate intervention for a stable patient with atelectasis or retained secretions. However, for a patient who is acutely deteriorating with confusion and a significant drop in oxygen saturation to 88%, this is an insufficient and delayed response. The patient's restlessness and confusion indicate that they may not be able to follow commands effectively, and a more urgent, provider-level escalation is required.

Pathophysiological Rationale and Clinical Integration
The combination of hypoxemia and acute confusion in a COPD patient on oxygen therapy raises a high index of suspicion for acute-on-chronic respiratory failure, potentially with carbon dioxide narcosis. The nurse's role is to perform a rapid clinical assessment to gather critical data (airway status, work of breathing, lung sounds, and mental status) that will guide the physician's next steps. The knowledge component of oxygen therapy practice, as evaluated in the supporting study, includes understanding the physiological risks of oxygen administration in this population and the importance of continuous monitoring to detect early signs of decompensation ^[1]. This clinical judgment—recognizing that a change in mental status is a late and ominous sign of respiratory failure—is what differentiates safe, effective nursing practice from task-oriented care.