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ModerateRespiratoryAcute severe asthmauk-plab-1

A 30-year-old man with asthma presents with severe wheeze and breathlessness. He is unable to complete sentences in one breath, respiratory rate is 30/min, pulse 120/min, peak expiratory flow (PEF) is 45% of predicted, and SpO₂ is 93% on air. What is the most appropriate immediate management?

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