Management of Acute Gastroenteritis with Moderate Dehydration

Assessment of Dehydration

The American Academy of Pediatrics and other medical societies characterize moderate dehydration (6-9% fluid deficit) by loss of skin turgor, dry mucous membranes, and decreased urine output, with reliable indicators including rapid, deep breathing, prolonged skin retraction time, and decreased perfusion 1, 2

The Centers for Disease Control and Prevention recommends administering ORS containing 50-90 mEq/L of sodium at a dose of 100 mL/kg over 2-4 hours as the first-line therapy for moderate dehydration 1, 2
The World Health Organization suggests starting with small volumes (e.g., one teaspoon) using a teaspoon, syringe, or medicine dropper, then gradually increasing the amount as tolerated 2
Reassess hydration status after 2-4 hours; if still dehydrated, reestimate the fluid deficit and restart rehydration therapy, according to the American College of Gastroenterology 2

The American Academy of Pediatrics recommends replacing ongoing stool and vomit losses during both rehydration and maintenance therapy, with 10 mL/kg of ORS for each diarrheal stool and 2 mL/kg of ORS for each episode of emesis 2
For infants <10 kg, provide 60-120 mL ORS for each diarrheal stool or vomiting episode, up to ~500 mL/day, as suggested by the European Society for Pediatric Gastroenterology 1

The World Health Organization recommends that breastfed infants continue nursing on demand throughout the illness, while bottle-fed infants should be administered full-strength, lactose-free, or lactose-reduced formulas immediately upon rehydration 1, 2

The American College of Gastroenterology recommends using low-osmolarity ORS for all age groups with any cause of diarrhea, with commercial formulations including Pedialyte, CeraLyte, and Enfalac Lytren 1

The Centers for Disease Control and Prevention suggests switching to intravenous fluids if there is progression to severe dehydration, shock, altered mental status, or failure of ORS therapy, using isotonic solutions such as lactated Ringer's or normal saline 1

The American Academy of Pediatrics recommends regularly assessing clinical signs including skin turgor, mucous membrane moisture, and mental status, as well as monitoring stool frequency and consistency 1, 2

For infants unable to drink but not in shock, nasogastric tube administration at 15 mL/kg/hour is an alternative, as recommended by the Centers for Disease Control and Prevention (CDC) 3, 4

Children <2 years should receive 50-100 mL of ORS after each stool, according to the CDC 3, 4, 5
Older children should receive 100-200 mL after each stool, as per the CDC guidelines 3, 4, 5
Adults should receive as much ORS as they want, though those failing to respond promptly should be reassessed to exclude cholera, following CDC recommendations 3, 4, 5

Children >4-6 months should be offered age-appropriate foods every 3-4 hours as tolerated, as suggested by the CDC 3, 4, 5

Weight changes throughout therapy should be regularly assessed, as recommended by the CDC 3, 4, 5