Treatment of Acute Gastritis in Pediatric Patients

Primary Treatment Approach

The American Academy of Pediatrics recommends oral rehydration therapy with low-osmolarity oral rehydration solution (ORS), combined with continued age-appropriate feeding and no dietary restrictions, as the cornerstone of managing acute gastritis in children 1

The Centers for Disease Control and Prevention (CDC) guidelines evaluate dehydration using clinical examination focusing on mild dehydration (3-5% fluid deficit), moderate dehydration (6-9% fluid deficit), and severe dehydration (≥10% fluid deficit) 2

For mild dehydration (3-5% deficit), administer 50 mL/kg of low-osmolarity ORS over 2-4 hours, with small volumes initially (5-10 mL every 1-2 minutes) using a teaspoon, syringe, or medicine dropper, gradually increasing as tolerated 2
For moderate dehydration (6-9% deficit), administer 100 mL/kg of low-osmolarity ORS over 2-4 hours using the same small-volume technique 2
For severe dehydration (≥10% deficit, shock, altered mental status), immediate intravenous rehydration with isotonic crystalloid (lactated Ringer's or normal saline) in 20 mL/kg boluses until pulse, perfusion, and mental status normalize 1, 2

The American Academy of Pediatrics recommends resuming age-appropriate normal diet immediately with no dietary modifications, and continuing breastfeeding throughout the illness without interruption 1
Replace ongoing losses with ORS: 60-120 mL for children <10 kg per diarrheal stool/vomiting episode (up to ~500 mL/day); 120-240 mL for children >10 kg per episode (up to ~1 L/day) 1

Do not use popular beverages (apple juice, Gatorade, commercial soft drinks) for rehydration—they are inadequate and inappropriate 1
Do not withhold food or use "clear liquids only" approach—this is outdated and nutritionally harmful 3
Do not use hypotonic solutions for initial rehydration in severe dehydration as they worsen electrolyte imbalances 4

Reserve hospitalization for severe dehydration with signs of shock, altered mental status or inability to protect airway, and ileus preventing oral intake 1