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An 82-year-old woman with mild dementia is admitted from home with three days of confusion that fluctuates and is worse at night. She is drowsy but rousable and cannot sustain attention on simple tasks. She is afebrile, blood pressure is 130/76 mmHg, oxygen saturation 96% on room air and blood glucose 6.4 mmol/L. The intern has already sent a full blood count, electrolytes and liver biochemistry, dipsticked and sent a urine specimen, and reviewed her medication chart. Her husband, who cares for her at home, is at the bedside. Which one of the following should the intern do next?
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