Abstract
Thed-xylose breath H2 test may be useful in characterizing intestinal absorptive function. Our aim was to determine whether breath H2 followingd-xylose administration reflects the extent to which thed-xylose is absorbed by comparing it to a kinetic model ofd-xylose absorption. Twenty-five subjects were studied. They ingested 15 gd-xylose on the first day and 25 gd-xylose on the third day. On the second day they received 10 g intravenousd-xylose along with 15 g oral lactulose. Multiple serum and urine samples were obtained ford-xylose content to calculate its rate constants and extent of absorption by multicompartmental analysis. Breath H2 determinations were obtained every 15 min for 3 hr following the 15 gd-xylose and lactulose ingestion. Peak breath H2 concentration correlated with extent of absorption (r=−0.787,P<0.001),K 0, the rate constant for nonabsorptive loss (r=0.744,P<0.001), and 5-hr urine content (r=−0.705,P<0.001). Area under the breath H2 curve also correlated with these parameters: extent of absorption (r=−0.770,P<0.001),K 0 (r=0.662,P<0.001), 5-hr urine content (r=−0.629,P<0.012). Peakd-xylose breath H2 to peak lactulose breath H2 showed no correlation with extent of absorption. The extent of absorption was higher with the 15-g dose than the 25-g dose in all patients tested (P<0.01). This was the result of decreased nonabsorptive loss (lowerK 0), as the rate constant for absorption,K a , was not statistically different (P>0.05). Peakd-xylose breath H2 can be used as an inverse estimate ofd-xylose absorption. Lactulose breath H2 cannot be used as a standard for comparison ford-xylose. The three compartment kinetic model ford-xylose absorption with passive absorption of this carbohydrate is supported by similar rate constants for absorption for the twod-xylose doses used.d-xylose at 15 g may be a more appropriate dose than 25 g for H2 breath testing as it does not lead to increased nonabsorptive losses.
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Supported in part by grant RR0048, National Institutes of Health, National Center for Research Resources.
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Carlson, S., Craig, R.M. D-Xylose hydrogen breath tests compared to absorption kinetics in human patients with and without malabsorption. Digest Dis Sci 40, 2259–2267 (1995). https://doi.org/10.1007/BF02209016
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DOI: https://doi.org/10.1007/BF02209016