Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0024523 (malabsorption)
 7,319 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

120 Danish patients with ulcerative colitis, admitted consecutively to a Department of Gastroenterology, were investigated for lactose malabsorption. The prevalence was 9.2 percent, which is not significantly higher than that in a mixed Danish gastroenterological material, There was no difference in distribution according to age and sex, and the incidence was not correlated to the severity of the ulcerative colitis. The possible reasons for the wide variation in the incidence of lactose malabsorption in materials of patients with ulcerative colitis are discussed, and it is concluded that the main cause must be that the materials with the highest incidence include patients of races and ethnic groups in which lactose malabsorption is a common finding.
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PMID:The incidence of lactose malabsorption in ulcerative colitis. 113 28

Diagnostic value of disaccharide tolerance tests in children. Acta Paediatr Scand, 64:693, 1975.--The diagnostic value of oral lactose and sucrose tolerance tests was investigated in 61 children. A total of 105 oral disaccharide tests were carried out. When the rise in blood sugar was low, the same disaccharide was, as a control measure, instilled directly into the small intestine through a tube. This was carried out in 40 cases. In 21 patients the rise in blood sugar following the two forms of administration was correlated with the disaccharidase activity in a peroral small-intestine biopsy. The incidence of false-positive oral lactose tests was between 23 and 30%, that of false-positive oral sucrose tests between 24 and 33%. A border value of 20 mg per 100 ml in the rise of blood glucose within the first hour following a direct intra-intestinal administration affords a very satisfactory distinction between patients with and without disaccharide malabsorption. Blood glucose determinations exceeding one hour were found to be without diagnostic value.
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PMID:Diagnostic value of disaccharide tolerance tests in children. 116 89

The absorption of fat and the absorption and retention of nitrogen were studied in 20 children with kwashiorkor. 13 of the 20 had lactose malabsorption and severe diarrhoea on milk feeds. Fat absorption was not affected by lactose-induced diarrhoea, but nitrogen absorption was impaired. Despite this, nitrogen retention was unaffected and it is concluded that milk and milk products would continue to be used in programmes to eliminate malnutrition.
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PMID:Effect of lactose-induced diarrhoea on absorption of nitrogen and fat. 119 Aug 12

A combined xylose-lactose tolerance-test and a duodenal biopsy were performed in 68 children with suspected malabsorption-syndrome. The purpose of the present work was to assess the diagnostic value of xylose concentrations in blood at different times and to determine the additional discriminatory value to glucose levels. The contribution of the glucose rise to a calculated discriminant function is statistically significant but practically negligible and therefore does not justify its determination. A small-bowel biopsy is recommended if the concentration of xylose after 60 min is less than 26 mg/100 ml or the increment of xylose concentration above fasting level is 18 mg/100 ml or less.
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PMID:[The application of a combined Xylose-lactose tolerance-test in children with suspected malabsorption (author's transl)]. 125 51

Brush-border membrane proteins of the small-bowel mucosa were separated on polyacrylamide gels from intestinal biopsy specimens obtained from four children with congenital lactose malabsorption and from two adults with specific hypolactasia. In three patients with the congenital type of lactase deficiency the protein band corresponding to brush-border lactase was reduced in intensity, but was never completely absent. No difference in gel patterns was detected when this pattern in congenital deficiency was compared to that obtained from the two patients with adult-type selective hypolactasia. In one patient with congenital lactose malabsorption the protein band corresponding to lactase activity was not detectable. The findings suggest that the mechanisms leading to low lactase activity in the congenital and adult forms of lactose intolerance are similar.
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PMID:Protein patterns of brush-border fragments in congenital lactose malabsorption and in specific hypolactasia of the adult. 125 11

The quantity of lactose not absorbed by 4 normal and 6 lactase-deficient subjects was determined by three indirect methods which involved: (1) measurement of pulmonary hydrogen (H2) excretion, (2) pulmonary (14)CO2 excretion, and (3) stool (14)C excretion, after ingestion of 12.5 g of 1-(14)C-lactose and 4 g of polyethylene glycol (PEG). Results were compared with absorption determined directly from the (14)C:PEG ratio of multiple terminal ileal aspirates. The fraction of lactose not absorbed determined by ileal aspiration ranged from 0 to 8% in normals and 42 to 75% in mild-intolerant subjects. Whereas all three indirect methods were useful in qualitatively separating normal from deficient subjects, the quantity of lactose absorbed as determined by H2 excretion correlated most closely with ileal measurements (r = 0.94). Pulmonary (14)CO2 excretion for 24 hr after (14)C-lactose ingestion did not distinguish normal (17 +/- 4% (SEM) of ingested (14)C per 24 hr) from lactase-deficient subjects (21.1 +/- 3%). Likewise, stool (14)C:PEG ratios grossly underestimated malabsorption with less than one-quarter of the nonabsorbed (14)C appearing in the stool. This study suggests that individual differences in susceptibility to diarrhea after milk ingestion by lactase-deficient subjects may be due to differences in the quantity of lactose not absorbed and/or differences in the rate of bacterial metabolism of lactose in the colon. Analysis of ileal fluid collected during passage of the lactose meal indicated that about two-thirds of the osmotic load delivered to the colon consists of endogenous electrolytes. Thus the water load delivered to the colon is about 3 times that calculated to be osmotically held by the nonabsorbed sugar.
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PMID:Quantitative measurement of lactose absorption. 126 65

Lactose malabsorption was investigated in 169 Chinese children aged between two and 16 years using the breath hydrogen test. The challenge was either lactose solution (1 g/kg) or cow's milk (10 ml/kg). Overall, 68% of the children showed a significant increase in breath hydrogen following the lactose challenge while only 17% showed an increase after the cow's milk challenge and 13% after both challenges. The number of malabsorbers increased significantly (p less than 0.001) with age and no associated gastrointestinal symptoms or signs were found in any of the children following the challenges, suggesting a gradual and partial loss of intestinal lactase activity. We conclude that the prevalence of lactose malabsorption in Hong Kong children is very high using the standard lactose tolerance test but when a more realistic amount of lactose and a natural medium such as a glass of milk is used as the challenge, the number of malabsorbers becomes small and clinically insignificant.
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PMID:The status of lactose absorption in Hong Kong Chinese children. 139 83

Individual components of milk from humans and other mammalian species may influence the severity, duration, and nutritional outcome of childhood diarrhea in different ways. Nonetheless, empirical data from clinical trials can be used to assess children's responses to specific milk-containing diets. Factors modifying the response to milk include its source, amount, frequency of feeding, type of processing, and accompanying foods, as well as the type and severity of enteric infection and specific characteristics of the host. Whereas breast-fed infants have less severe diarrhea when breast milk is continued rather than interrupted, infants and children fed with non-human milks tend to have more severe illness than those receiving milk-free or lactose-limited formulas or milk-cereal mixtures. Fermentation of milk may reduce the severity of lactose malabsorption, but additional information regarding the efficacy of yogurt in acute, childhood diarrhea is still needed.
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PMID:Effect of milk-containing diets on the severity and duration of childhood diarrhea. 142 48

A prospective study was done to determine the incidence of disaccharide intolerance among 3-36 month-old patients with acute watery diarrhea who were on breast feeding and/or lactose-containing formula. The effect of feeding intervention on the outcome was investigated. Significant disaccharide intolerance was defined as one with (1) biochemical derangements: stool pH < 6.0 (Riedel de Haen pH paper) and reducing substances > or = 0.5 mg% (Clinitest) on two consecutive determinations and (2) clinical evidence: high purging rate (> 10 gm/kg/hour) and reappearance of dehydration and/or weight loss while on a lactose containing milk. Seven of 92 patients (7.8%) had biochemical evidence of disaccharide malabsorption on admission. Subsequent monitoring of the study population showed absence of disaccharide intolerance. Despite a lactose containing formula, a significant (p < 0.05) reduction in stool output from the first to the second day (145.85 +/- 130.26 vs 115.43 +/- 95.65 g/kg admission weight) was noted. Likewise, weight gain from admission to discharge (4.56 +/- 3.44%) was observed. The mean total duration of illness (4.75 +/- 2.84 days) was well within the usual course of five to seven days. This study supports the current recommendation of continued breast feeding and/or use of lactose containing formula during acute watery diarrhea.
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PMID:Nutritional intervention in acute diarrhea: is a lactose-free formula essential? 143 75

During a six-year period, 29 children (aged 0.7-13.5 years, mean 3.3 years) suffering from chronic diarrhoea due to giardiasis were studied. The incidence of this illness was 81 per 1,000,000 children aged 0- < 7 years per year. According to growth charts, relative height and weight of the patients decreased significantly (approximately 0.5 SD) from before the onset of diarrhoea to the time of diagnosis and subsequently increased up to the end of catch-up growth. Small intestinal mucosal specimens were studied. Two patients had severe villous atrophy, 8 moderate abnormalities, 6 only light changes and 13 biopsies were normal. D-xylose or lactose malabsorption was detected in 25% of the patients. The lactose malabsorption was due to hereditary low lactase levels. None of the patients with a Danish ethnic background showed lactose malabsorption. D-xylose absorption and the relative weight loss of the patients correlated with the degree of mucosal damage. Patients with persistent diarrhoea (n = 19) were younger and had a shorter duration of diarrhoeal illness and a more significant weight reduction than those with intermittent diarrhoea (n = 10). However, the age at onset of symptoms was similar in the two groups (medians 1.3 years). Seven patients contracted the disease abroad. They all developed persistent diarrhoea and had a more severe course of the illness than those who acquired the disease in Denmark.
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PMID:Giardiasis causing chronic diarrhoea in suburban Copenhagen: incidence, physical growth, clinical symptoms and small intestinal abnormality. 146 10


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