Effect of the administration of fermentable and non-fermentable dietary fibre on intestinal bacterial translocation in ascitic cirrhotic rats.

BACKGROUND: Bacterial infections are frequent in cirrhosis. Experimental studies suggest a pathogenic role of intestinal bacterial translocation in them. Both fermentable and non-fermentable fibre avoided intestinal bacterial translocation (IBT) in animal models of gut starvation and critical illness. AIM: To assess the effect of fermentable (pectin) or non-fermentable (lignin) fibre on IBT in ascitic cirrhotic rats. METHODS: Thirty-six rats induced to cirrhosis with oral CCl4 were randomized (6 weeks after the first CCl4 dose) to receive rat chow+5% lignin (LIG, n=13), rat chow+5% pectin (PEC, n=13), or rat chow only (CON, n=10). Once ascites developed, animals were laparotomized and samples of mesenteric lymph nodes (MLN), ascitic fluid, portal and peripheral blood and liver, were obtained for culture. RESULTS: IBT rate was: LIG=5/13, PEC=4/13, CON=5/10 (P=N.S.). The median amount of translocated bacteria in rats with IBT was lower in the PEC group (2 x 10(2) CFU/g MLN), than in LIG (10(5) CFU/g MLN) and CON (10(4) CFU/g MLN) groups (P<0.05). All other samples were sterile except for a portal blood sample (Enterococcus faecalis) of the LIG group. CONCLUSIONS: IBT incidence is not decreased by either pectin or lignin in ascitic cirrhotic rats, but pectin supplementation reduces the amount of translocated bacteria.