Rehydration Plans for Dehydration in Adults

Evaluation and Treatment

The American College of Physicians recommends rehydration in adults should start with oral rehydration solution (ORS) of reduced osmolarity for mild to moderate dehydration, and intravenous isotonic fluids for severe dehydration, maintaining nutrition throughout the process 1
The World Health Organization (WHO) recommends ORS with the appropriate balance of electrolytes and glucose for effective water absorption, regardless of the cause of gastroenteritis 1
For mild dehydration (3-5% fluid deficit), patients typically exhibit increased thirst and slightly dry mucous membranes 1
For moderate dehydration (6-9% fluid deficit), patients typically exhibit loss of skin turgor and dry mucous membranes 1
For severe dehydration (≥10% fluid deficit), patients typically exhibit severe lethargy or altered consciousness, prolonged skin fold, and hypovolemic shock 1, 2

Administer reduced osmolarity ORS as first-line therapy: 50 mL/kg over 2-4 hours for mild dehydration and 100 mL/kg over 2-4 hours for moderate dehydration 1
After each bowel movement, adults should consume as much fluid as desired 1, 3
If the patient cannot tolerate oral intake, consider nasogastric tube administration at a rate of 15 mL/kg/hour 1, 3

Severe dehydration constitutes a medical emergency requiring immediate intravenous isotonic fluids: administer Ringer's lactate or normal saline in 20 mL/kg boluses 2
Continue intravenous rehydration until pulse, perfusion, and mental status normalize 1, 2
Once stabilized, the remaining deficit can be replaced using ORS 1, 2

After initial rehydration, provide maintenance fluids and replace ongoing losses with ORS until diarrhea and vomiting resolve 1, 3
Reassess hydration status after 3-4 hours and continue treatment according to the degree of dehydration 1, 3

There is no justification for "resting the intestine" through fasting - this delays recovery: resume appropriate diet during or immediately after rehydration 1
Foods rich in energy and easily digestible help maintain nutritional status 4

Do not use popular beverages like apple juice, Gatorade, or commercial soft drinks for rehydration: they lack the appropriate electrolyte composition and can worsen dehydration 2, 3, 4

For older adults with dehydration, encourage increased fluid intake with preferred beverages if the patient appears well, or offer subcutaneous or intravenous fluids in parallel with oral intake if the patient appears unwell 3

Do not delay treatment for severe dehydration - it constitutes a medical emergency 1
Do not use antimotility agents as routine treatment for uncomplicated watery diarrhea 4
Do not administer antidiarrheal drugs, stimulants, steroids, or purgatives - they are contraindicated and can produce adverse effects 4