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A 28-year-old female with known severe asthma is experiencing status asthmaticus. She has received 3 albuterol nebulizers and CPAP without improvement. She can only speak single words, has diminished breath sounds bilaterally, and SpO2 is 82% despite supplemental oxygen. In addition to continuing CPAP and bronchodilators, what medication should be administered?

Adenosine 6mg rapid IV push Epinephrine 0.3mg IM Atropine 0.5mg IV Diphenhydramine 50mg IV