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A 45-year-old female with a history of asthma presents in severe respiratory distress. She states her home nebulizer treatments have not helped. She is sitting in tripod position, speaking in 2-word sentences, with SpO2 of 88% on room air. Capnography shows a "shark fin" waveform with ETCO2 of 58 mmHg. What is the MOST appropriate treatment?

Albuterol nebulizer only and transport CPAP with inline albuterol and methylprednisolone IV Immediate endotracheal intubation High-flow oxygen via non-rebreather mask only