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EasyRespiratory MedicineAcute Asthma Exacerbationus-abemus-usmle-step-2

A 26-year-old woman presents with an acute asthma exacerbation, with a peak expiratory flow (PEF) of 45% predicted. She has received repeated albuterol-ipratropium nebulizations and systemic steroids but remains in moderate distress. What is the best next adjunct?

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