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MediumRespiratory MedicineAcute Severe Asthmaukmlamrcgp aktpanemrcem sbaprescribing safety assessment

A 25-year-old man presents with an acute asthma exacerbation. He has used his salbutamol inhaler every 20 minutes without relief. Peak expiratory flow is 35 % of predicted. Oxygen saturation is 94 % on air. According to the BTS/SIGN-aligned NICE guideline, which additional treatment should be given immediately?

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