A nurse is caring for a 65-year-old client with COPD exacerbation and a history of asthma who has been receiving continuous nebulizer treatments for the past 2 hours and is not responding adequately to initial bronchodilator therapy. The client's peak expiratory flow rate (PEFR) remains at 35% of personal best, oxygen saturation is 90% on 4L nasal cannula, and the client appears increasingly anxious and fatigued. What is the nurse's priority intervention?

With PEFR 35%, SpO2 90% on oxygen, and fatigue/anxiety despite bronchodilators, the client shows signs of impending respiratory failure, making preparation for intubation the priority. Other options are insufficient (increasing oxygen or albuterol) or not immediately life-saving (corticosteroids).

Clinical Context & Pathophysiology
This client is experiencing a life-threatening asthma-COPD overlap exacerbation that has progressed despite 2 hours of continuous nebulized bronchodilators. The combination of a PEFR at only 35% of personal best, hypoxemia (SpO₂ 90% on 4L oxygen), and worsening anxiety with fatigue signals impending acute respiratory failure (ARF). In severe asthma and COPD exacerbations, persistent bronchial smooth muscle contraction, airway inflammation, and mucus hypersecretion increase airway resistance and work of breathing ^[1][2]. When the patient becomes fatigued and anxious, it indicates that compensatory mechanisms are failing and the ability to maintain spontaneous ventilation is deteriorating.

Why Option 1 Is the Priority
Preparing for possible intubation and invasive mechanical ventilation (MV) is the correct priority intervention. In severe exacerbations that are nonresponsive to initial maximal medical therapy, patients are at high risk for developing hypercapnic respiratory failure and respiratory arrest ^[1][2]. The clinical presentation—persistent severe airflow obstruction (PEFR 35%), inadequate oxygenation, and signs of exhaustion—meets the criteria for impending ventilatory failure. Delaying preparation for airway management in this scenario risks a crash intubation under emergency conditions, which carries higher morbidity. Evidence emphasizes that patients with severe asthma exacerbations who fail to respond to bronchodilators and show progressive fatigue may eventually require invasive MV, and proactive preparation is a critical nursing safety intervention ^[2].

Why the Other Options Are Incorrect
- Option 2: Increasing oxygen to 6L via nasal cannula addresses hypoxemia but does not correct the underlying problem of severe airflow obstruction and ventilatory failure. While oxygen titration is important, the immediate threat is loss of airway protection and ventilatory drive, not solely hypoxemia. Furthermore, high-flow nasal cannula may not adequately support ventilation in a fatiguing patient with severe obstruction ^[2].
- Option 3: Administering another albuterol treatment is not the priority because the patient has already received 2 hours of continuous nebulization without adequate response. Additional bronchodilator therapy at this point delays definitive airway management and is unlikely to reverse the severe bronchospasm and fatigue rapidly enough to prevent decompensation ^[1].
- Option 4: Intravenous corticosteroids are a cornerstone of managing severe exacerbations by reducing airway inflammation, and they should be administered promptly ^[1]. However, their onset of action takes hours, and they will not immediately reverse the impending ventilatory failure. In the prioritization framework, securing the airway takes precedence over therapies with delayed onset when the patient is actively deteriorating.

Nursing Clinical Reasoning
The nurse must recognize the progression from severe exacerbation to impending respiratory arrest. The triad of persistent severe airflow obstruction, hypoxemia, and exhaustion despite maximal bronchodilator therapy indicates that noninvasive supports may no longer be sufficient, and the patient is approaching the need for invasive MV ^[2]. The priority nursing action is to prepare the environment, equipment, and team for emergency intubation while continuing to support oxygenation and monitoring the patient closely. This anticipatory approach aligns with the framework for managing life-threatening obstructive lung disease exacerbations in the ICU, where timely escalation to invasive ventilation prevents adverse outcomes ^[1][2].