Currently recommended management of acute gastroenteritis is supportive. Although the affected children habitually have vomiting, recommendations do not focus on the correction of this symptom. In this condition, elevated ketone bodies and stimuli initiated by gut mucosa damage produced by the enteral pathogen likely underlay nausea and vomiting. As compared to 0.9% saline, intravenous administration of a dextrose-containing bolus of 0.9% saline is associated with a greater reduction of circulating ketones and a shorter duration of nausea and vomiting. Nonetheless, this treatment strategy is not followed by a lower rate of hospitalization.

CONCLUSIONS

Well-designed investigations suggest that antagonists of the type 3 serotonin receptor, most frequently oral ondansetron, reduce the rate of vomiting, improve the tolerance of oral rehydration, and reduce the need for intravenous rehydration. What is Known: • Although children with gastroenteritis habitually have vomiting, current recommendations do not focus on the correction of this symptom. What is New: • Recently acquired evidence supports the prescription of ondansetron, an antagonist of the type 3 serotonin receptor, to increase the success rate of oral rehydration therapy.