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A 52-year-old man who lives alone is found drowsy on his kitchen floor and brought in by ambulance. He drinks heavily, is visibly thin, and his neighbour says he has vomited for three days and eaten nothing. He opens his eyes to voice, is confused, and is protecting his own airway. Respiratory rate 16/min, oxygen saturation 97% on room air, temperature 36.2 °C, blood pressure 128/76 mmHg. The capillary blood glucose is 2.8 mmol/L. A cannula is in and bloods have been sent. Which one of the following should be given or arranged before any of the others?
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