Management of Acute Gastritis with Moderate Dehydration

Initial Assessment and Rehydration

The American College of Physicians and the Infectious Diseases Society of America recommend initiating oral rehydration solution (ORS) at 100 mL/kg over 2-4 hours as first-line therapy for patients with acute gastritis and moderate dehydration, with nasogastric administration if oral intake fails, reserving intravenous fluids only for inability to tolerate ORS or clinical deterioration 1, 2
Quantify fluid losses by documenting the number of vomiting episodes in the past 24 hours, frequency and volume of any diarrhea, last urination time, and ability to tolerate oral fluids, as suggested by Clinical Infectious Diseases guidelines 3
Identify red flags such as bloody stools, fever >38.5°C, severe abdominal pain, altered mental status, or signs of sepsis that would change management, according to Clinical Infectious Diseases 1

Administer reduced osmolarity ORS containing 50-90 mEq/L sodium at 100 mL/kg over 2-4 hours for moderate dehydration (6-9% deficit), as recommended by Clinical Infectious Diseases 1, 2, 3
Replace ongoing losses by adding 10 mL/kg ORS for each vomiting episode and any additional diarrheal losses, according to Clinical Infectious Diseases 1, 2, 3

Ondansetron may be given to patients with persistent vomiting to enhance ORS compliance, as suggested by Clinical Infectious Diseases 1, 4
Loperamide is contraindicated in children <18 years with acute gastritis/gastroenteritis, and should be used cautiously in adults only after adequate rehydration and only if no fever or bloody stools are present, according to Clinical Infectious Diseases and Praxis Medical Insights 1, 4, 5

Monitor clinical parameters every 2-4 hours, including vital signs, hydration markers, tolerance, and weight, as recommended by Clinical Infectious Diseases and Praxis Medical Insights 1, 2, 6
Criteria for successful rehydration include normal pulse and perfusion, improved mental status, moist mucous membranes, adequate urine output, and ability to tolerate oral fluids without immediate vomiting, according to Clinical Infectious Diseases and Praxis Medical Insights 1, 4, 3

Resume age-appropriate normal diet immediately after rehydration or during the rehydration process, and continue breastfeeding throughout illness without interruption in infants, as recommended by Clinical Infectious Diseases and Praxis Medical Insights 1, 2, 5
Early feeding promotes intestinal cell renewal, prevents nutritional deterioration, and is as safe as delayed feeding, according to Praxis Medical Insights 3, 5

Patients can be safely discharged when rehydration is complete, they are tolerating adequate oral intake without immediate vomiting, and there is a reliable caregiver with clear return precautions, as suggested by Clinical Infectious Diseases and Praxis Medical Insights 1, 2, 3
Admission is indicated for failure of ORS therapy, severe acidosis, inability to maintain hydration with ongoing losses, and social concerns about home management, according to Clinical Infectious Diseases and Praxis Medical Insights 1, 2, 3