The nurse is caring for a 78-year-old client admitted to the medical intensive care unit in respiratory distress. What does the nurse determine is the priority for this client's care?

A. Administering corticosteroids to reduce inflammation: Corticosteroids may reduce inflammatory lung injury in certain conditions, but they do not provide immediate correction of hypoxemia or hypercapnia. Their onset is delayed and they do not address the acute ventilatory failure reflected by rising PaCO₂ and severe acidemia. B. Intubating for mechanical ventilation support: The client demonstrates acute respiratory failure with hypoxemia (PaO₂ 66 mm Hg), hypercapnia (PaCO₂ 51 mm Hg), and acidemia (pH 7.2). Failure to respond to high-flow oxygen suggests refractory hypoxemia. Mechanical ventilation provides controlled oxygen delivery, improves ventilation, reduces work of breathing, and corrects both oxygenation and CO₂ retention. C. Opening airways with aerosol treatments: Bronchodilators are beneficial in bronchospasm (e.g., asthma, COPD), but this client’s findings—crackles, rust-colored sputum, and infection—suggest alveolar filling and consolidation rather than airway constriction. Aerosol therapy will not significantly improve gas exchange in this scenario. D. Treating infection with antibiotics: Antibiotics are essential given the elevated WBC and positive blood cultures indicating bacterial infection, likely pneumonia. However, antimicrobial therapy does not provide immediate correction of life-threatening hypoxemia and respiratory acidosis, so airway and breathing take priority over infection management.