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Immaturity of intestinal epithelial barrier function and absorptive capacity may play a role in the pathophysiology of intestinal complications in preterm neonates during the early postnatal period. We determined the intestinal permeability and carrier-mediated absorption of monosaccharides in preterm neonates during the first 2 wk after birth. Fifty-nine preterm neonates born between 25 and 32 wk gestation were included within 24 h of birth. Neonates received exclusively parenteral nutrition during the first 7 d after birth; enteral feeding was initiated at d 8. An intestinal permeability-absorption test was performed at 1, 4, 7, and 14 d after birth. The lactulose-to-rhamnose ratio was determined as a marker of intestinal permeability. Urinary excretion percentages of D-xylose and 3-O-methyl-D-glucose were determined as markers of passive and active carrier-mediated monosaccharide absorption, respectively. Intestinal permeability transiently increased between d 1 and 7 in all neonates (p &lt; 0.05). Carrier-mediated monosaccharide absorption increased between d 1 and 14 in neonates of 28-30 wk (p &lt; 0.05) to the level observed in the neonates of 30-32 wk gestation. In neonates &lt;28 wk, intestinal permeability at d 7 was higher (p &lt; 0.05) and carrier-mediated monosaccharide absorption at d 14 was lower (p &lt; 0.01) as compared with neonates &gt;or=28 wk. The barrier function of the intestinal epithelium transiently decreases during the first week after birth in preterm neonates who are not enterally fed. Diminished barrier function and low monosaccharide absorptive capacity, particularly in neonates &lt;28 wk, may predispose these patients to the development of intestinal complications during the early postnatal period.

Intestinal Permeability and Carrier-Mediated Monosaccharide Absorption in Preterm Neonates during the Early Postnatal Period