Management of Acute Viral Gastroenteritis

Assessment and Rehydration

The American College of Physicians and the Infectious Diseases Society of America recommend oral rehydration solution (ORS) as the cornerstone of treatment for patients with suspected viral diarrhea and abdominal pain without vomiting, and empiric antibiotics should be avoided 1, 2
Assess dehydration severity by examining skin turgor, mucous membranes, mental status, pulse, capillary refill, and urine output to guide treatment intensity 2
Categorize dehydration as mild (3-5% fluid deficit), moderate (6-9% fluid deficit), or severe (≥10% fluid deficit) to determine the appropriate rehydration protocol 2, 3

For mild dehydration (3-5% deficit), administer 50 mL/kg of reduced osmolarity ORS over 2-4 hours, as recommended by the World Health Organization 1, 2
For moderate dehydration (6-9% deficit), administer 100 mL/kg of ORS over 2-4 hours, with ongoing replacement of losses 2, 3
Replace each watery/loose stool with 10 mL/kg of ORS to maintain hydration 2, 3

The American Gastroenterological Association recommends resuming age-appropriate normal diet immediately after rehydration is complete or during the rehydration process 1, 2
Early feeding is as safe and effective as delayed feeding and improves nutritional outcomes, according to the European Society for Pediatric Gastroenterology, Hepatology, and Nutrition 4

Empiric antimicrobial therapy is not recommended for acute watery diarrhea of suspected viral etiology, as stated by the Infectious Diseases Society of America 1
Loperamide 2 mg may be given to immunocompetent adults with acute watery diarrhea to reduce symptoms, but with caution and close monitoring, as advised by the American College of Gastroenterology 1
Probiotics may be offered to reduce symptom severity and duration in immunocompetent adults, according to the World Gastroenterology Organisation 1

Regularly assess clinical signs including skin turgor, mucous membrane moisture, mental status, stool frequency, and consistency to monitor treatment effectiveness 3
Monitor weight changes throughout therapy to ensure adequate rehydration 3
Do not use loperamide in children under 18 years of age, as recommended by the American Academy of Pediatrics 1
Do not give loperamide if the patient develops fever or bloody diarrhea, as this suggests bacterial or inflammatory etiology with risk of complications, according to the Centers for Disease Control and Prevention 1