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ModerateIV magnesium sulfate can reduce hospitalization. Aminophylline (A) is not first-line. Immediate intubation (B) is for impending failure. Montelukast (D) and ICS alone (E) are not acute ED therapies."Respiratory Medicine"easy"

A 40-year-old with severe asthma exacerbation in ED received albuterol/ipratropium and systemic steroids. Oxygen sat 91% on room air, peak flow 40% predicted. Next recommended step?

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