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An 82-year-old woman in a residential aged care facility has had watery diarrhoea and intermittent vomiting for two days. She is alert and oriented, her mucous membranes are slightly dry, and her weight has fallen from 62 kg to 60 kg. Pulse is 88 beats per minute, blood pressure 128/76 mmHg lying and 120/72 mmHg standing, and capillary refill is under two seconds. She passed urine an hour ago. A visiting nurse practitioner can insert an intravenous cannula if one is needed. Which one of the following rehydration regimens is most appropriate now?
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