Abstract：Objective To study the clinical characteristics of hospitalized infants with allergic proctocolitis, and to provide a scientific basis for early diagnosis and effective treatment of allergic proctocolitis. Methods The clinical data of 96 infants with allergic proctocolitis between September 2011 and March 2013 were reviewed retrospectively.Descriptive analysis was performed to assess the clinical characteristics of allergic proctocolitis. Results The most common clinical manifestation was diarrhea in the 96 infants. The electronic colonoscopy results indicated that 40% of the infants had multiple small nodules, 26% showed focal erythema and brittle mucous membranes, 25% showed multiple superficial erosion, and 9% showed ulcers with surface exudates. The affected areas included the sigmoid colon（87%), rectum（24%), descending colon（13%), and transverse colon ascending colon and ileocecal junction（8%). Histopathologic examination showed eosinophilic infiltration of mucosal layers, the condition of which was mild to moderate in 89% and severe and extremely severe in 12% of the infants. To treat the allergic proctocolitis, mothers and infants were suggested to avoid allergenic foods; 43% of them continued breastfeeding, 45% switched to highly hydrolyzed protein formula, and 13% were prescribed amino acid-based elemental formula. All infants were in complete remission at discharge. Conclusion As the clinical manifestations of allergic proctocolitis in infants lack specificity, the electronic colonoscopy and mucosal histopathologic examination are helpful for early and differential diagnosis. The best treatment is to avoid allergenic foods. Formula-feeding infants should be prescribed highly hydrolyzed protein formula or amino acid-based elemental formula.
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