Control of diarrhea by fiber-enriched diet in ICU patients on enteral nutrition: a prospective randomized controlled trial.

BACKGROUND AND AIMS Enteral fiber-free diets alter intestinal transit and produce diarrhea or constipation. This prospective double blind, controlled study evaluates the use of guar gum, a soluble fiber and a candidate prebiotic in enteral feeds, to prevent diarrhea and potential health benefits in intensive care unit patients. METHODS Twenty patients on enteral nutrition with persistent diarrhea were randomized to receive a new enteral feed either enriched with 2% soluble guar gum (study group, n = 10) or fiber-free (control group, n = 10) for 4 successive days. RESULTS The number of liquid stools in response to a soluble fiber-enriched diet was 2.0+/-0.9 (first day) vs. 1.0+/-0.7 (fourth day) (P < 0.01), and in the control group 1.2+/-0.7 (first day) vs. 2.1+/-0.8 (fourth day) (P < 0.05). In the fiber-enriched feed group, plasma glucose and cholesterol levels at termination of the study, respectively, reached 126+/-81 and 164+/-71 mg dl(-1), as compared to 333+/-108 and 378+/-26 mg dl(-1) on Day first (P < 0.01). In the control group, these values on the fourth day were, respectively, 267+/-94 and 263+/-79 vs. 247+/-115 and 315+/-78 on Day first (P > 0.05). CONCLUSIONS Guar gum-enriched enteral nutrition was related to a decrease of diarrheal episodes in ICU patients with preexisting diarrhea; and to a trend for lower plasma glucose and cholesterol levels.