A 28-year-old primigravida at 26 weeks gestation presents to the emergency department with acute dyspnea, wheezing, and chest tightness for 6 hours. Vital signs: RR 28/min, SpO2 88% on room air, HR 110/min. Spirometry is performed and shows the pattern marked **C** in the diagram. Arterial blood gas shows pH 7.48, PaCO2 32 mmHg, PaO2 68 mmHg. Which of the following is the most appropriate IMMEDIATE next step in management?
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