A nurse is caring for a client with chronic obstructive pulmonary disease (COPD) who is receiving oxygen therapy at 2 L/min via nasal cannula. The client's oxygen saturation is 88% and arterial blood gas results show: pH 7.32, PaCO2 58 mmHg, PaO2 55 mmHg, HCO3- 28 mEq/L. Which nursing intervention should the nurse implement first?

Clinical Reasoning and Prioritization

The client with COPD presents with a clinical picture indicative of acute hypoxemic and hypercapnic respiratory failure. The arterial blood gas (ABG) values reveal a pH of 7.32 (acidemia), PaCO2 of 58 mmHg (respiratory acidosis), and PaO2 of 55 mmHg (severe hypoxemia). The oxygen saturation of 88% on 2 L/min of oxygen confirms that the current therapy is insufficient to meet the client's physiological demands. In the context of COPD, a key pathophysiological concern is the hypoxic drive theory, where some individuals with chronic CO2 retention rely more on low PaO2 levels to stimulate breathing rather than the typical CO2 drive. Uncontrolled, high-flow oxygen can suppress this drive, leading to worsening hypoventilation and CO2 narcosis. Therefore, the nurse must exercise extreme caution before increasing the oxygen flow rate independently.

The systematic review by Syam et al. highlights that a hallmark of an acute COPD exacerbation is a symptom worsening that exceeds day-to-day variation and requires a change in management, including systemic treatment ^[3]. The ABG derangements in this scenario clearly represent a decompensation beyond daily fluctuations. While interventions such as positioning the client in high Fowler's position (option 3) and encouraging deep breathing and coughing (option 2) are valuable supportive measures to optimize ventilation-perfusion matching and secretion clearance, they do not address the urgent need for medical evaluation and definitive treatment escalation. The systematic review on the global burden of COPD by Gutiérrez-Villegas et al. underscores that acute exacerbations are a leading cause of morbidity and impose a substantial burden, necessitating prompt and effective intervention to prevent further clinical deterioration ^[1].

The nurse's immediate priority is to conduct a focused respiratory assessment—including work of breathing, level of consciousness, and lung sounds—and communicate these critical findings to the healthcare provider. This step ensures that the provider receives a comprehensive clinical picture to make an informed decision regarding advanced therapies, such as titrated oxygen delivery, non-invasive ventilation (e.g., BiPAP), or pharmacologic interventions. Increasing the oxygen flow rate to 4 L/min (option 1) without a specific provider order in a client with known or suspected CO2 retention could precipitate respiratory depression and is not the first-line nursing action. The assessment and notification sequence aligns with the nursing process, where data collection and analysis must precede the implementation of new, high-risk orders. The systematic review by Vatrella et al. on telenursing in chronic respiratory disease management reinforces the critical role of nursing assessment and timely communication in preventing emergency department visits and hospitalizations during exacerbations . A comprehensive assessment and provider notification directly facilitate the systemic treatment escalation required during an acute exacerbation as defined in the literature ^[3].