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

We examined the absorptive capacity and the nutritional condition of 14 infants with short bowel syndrome, whose residual small intestine was 90 cm or less. Their age ranged from 1 year to 18 years. Examined items were body weight, height, serum albumin, total cholesterol, triglyceride, fat soluble vitamins, trace elements and rapid turn over protein as markers of the nutritional condition. Fecal fat, fecal bile acid, d-xylose absorption test, sugar-, amino acid-evoked potential difference in the small intestine and disaccharidase activity of the mucosa were examined as markers of the absorptive capacity. Our results showed that the body weight was below the normal range in the patients with small intestine of less than 50 cm. Most nutritional markers were within normal range, however, cholesterol and vitamin D were low in the patients with fat malabsorption, especially in patients with less than 50 cm of small intestine. Fecal bile acid was higher than the normal range in all the patients. Potential difference was in normal range or slightly lower than normal in all the patients. We concluded that infants with less than 50 cm of small intestine had malabsorption of sugar, protein and fat. Therefore, prolonged nutrient support, especially fat, is necessary.
 ...
PMID:[Nutritional condition and absorptive capacity of 14 infants with short bowel syndrome]. 322 92

The effects of liver disease, fat malabsorption and sunlight exposure on serum vitamin D levels were determined in 21 optimally treated preadolescent cystic fibrosis (CF) children over a 12-month period. Manifest liver disease and fat malabsorption appeared not to affect the vitamin D level. However, the level fell significantly in winter, although not below the normal range, suggesting that sunlight exposure is a more important determinant of vitamin D levels in preadolescent CF children than liver disease and fat malabsorption.
 ...
PMID:Determinants of serum vitamin D levels in preadolescent cystic fibrosis children. 342 14

Previous studies suggest abnormalities in PO4 and perhaps vitamin D metabolism in the spontaneously hypertensive rat (SHR) compared with normotensive Wistar-Kyoto (WKY) control rats. The mechanism for the hypophosphaturia obscure, but intestinal malabsorption of P and/or the possibility of linkage to renal Na avidity has not been evaluated. Furthermore, if sustained, the potential effects of the hypophosphaturia on P balance are not known. The present investigation examined these issues. We found that the reduced P excretion occurs as early as age 22 days, the second day after weaning in the SHR, well before the onset of detectable hypertension. This phenomenon is dissociable from renal Na avidity, and sustained through the 12th week of age, the last week of our studies. Since P absorption is normal, external P balance is increased relative to the WKY control rats. The greater cumulative P retention from infancy to adulthood may explain the age-dependent fall in serum 1,25 dihydroxyvitamin D3 [1,25(OH)2D3] reported in the SHR by some investigators.
 ...
PMID:Nature and metabolic consequence of hypophosphaturia in spontaneously hypertensive rats. 347 94

The serum vitamin D2 and vitamin D3 metabolite concentrations and intestinal absorption of vitamin D2 were determined in healthy ambulatory and chronically institutionalized elderly subjects with normal renal function. The 25-hydroxyvitamin D (25OHD) concentrations were normal in all subjects (range, 8-43 ng/ml), although institutionalized subjects had a significantly lower mean value [19.2 +/- 2 (+/- SEM) ng/ml; P less than 0.01] compared with ambulatory subjects (25.3 +/- 2 ng/ml). All but one ambulatory subject had 25OHD3 as the major circulating form, whereas 25OHD2 was the major circulating metabolite in one third of the institutionalized subjects. The mean 1,25-dihydroxyvitamin D [1,25-(OH)2D] concentration in both groups was normal, but nine subjects had levels at or below the lower limit of normal despite normal 25OHD concentrations. Separate assay of 1,25-(OH)2D2 and 1,25(OH)2D3 revealed proportional distributions similar to those for 25OHD2 and 25OHD3. To study the effect of age on the intestinal absorption of vitamin D, we compared serum vitamin D2 concentrations after oral administration of 50,000 IU vitamin D2 in both healthy vitamin D-sufficient elderly subjects and young adults. We found no evidence of malabsorption of vitamin D in the elderly subjects. In summary, elderly subjects in New York, whether institutionalized or not, have normal serum 25OHD concentrations. However, while most elderly subjects have normal serum 1,25-(OH)2D levels, a significant proportion fail to produce normal concentrations of 1,25-(OH)2D, possibly due to age-related disturbances in renal synthesis of the hormone.
 ...
PMID:Serum vitamin D2 and vitamin D3 metabolite concentrations and absorption of vitamin D2 in elderly subjects. 348 27

As part of a randomised controlled study to assess the effect of pasteurization of breast milk on the growth of very-low-birth-weight infants, the longitudinal changes in serum calcium, phosphorus, alkaline phosphatase, 25-hydroxyvitamin D, and bone-gla-protein concentrations were investigated. Infants fed untreated own mother's milk grew more rapidly than those fed pasteurized pooled preterm milk and had higher serum alkaline phosphatase and lower phosphorus values. Serum calcium and 25-hydroxyvitamin D (25-OHD) concentrations were similar in the two groups. Despite the provision of 750 IU vitamin D daily from the 2nd week of life, serum 25-OHD values remained low in a number of infants in both groups, suggesting that either malabsorption of vitamin D or hepatic immaturity might be responsible for the persistently low values. Bone-gla-protein rose significantly after birth and was correlated with alkaline phosphatase values, but not with 25-OHD or phosphorus values. The study supports previous work that indicates that the low phosphorus content of breast milk is probably responsible for biochemical evidence of inadequate bone mineralization and that despite vitamin D supplementation, 25-OHD values do not rise adequately. Thirty-six infants were reexamined between 4 and 11 months after birth. The 25-OHD values had risen significantly in all infants except one who had vitamin D deficiency rickets.
 ...
PMID:Mineral homeostasis in very low birth weight infants fed either own mother's milk or pooled pasteurized preterm milk. 351 33

Cholestyramine, colestipol, clofibrate, gemfibrozil, nicotinic acid (niacin), probucol, neomycin, and dextrothyroxine are the most commonly used drugs in the treatment of hyperlipoproteinaemic disorders. While adverse reaction data are available for all of them, definitive data regarding the frequency and severity of potential adverse effects from well-controlled trials using large numbers of patients (greater than 1000) are available only for cholestyramine, clofibrate, nicotinic acid and dextrothyroxine. In adult patients treated with cholestyramine, gastrointestinal complaints, especially constipation, abdominal pain and unpalatability are most frequently observed. Continued administration along with dietary manipulation (e.g. addition of dietary fibre) and/or stool softeners results in diminished complaints during long term therapy. Large doses of cholestyramine (greater than 32 g/day) may be associated with malabsorption of fat-soluble vitamins. Most significantly, osteomalacia and, on rare occasions, haemorrhagic diathesis are reported with cholestyramine impairment of vitamin D and vitamin K absorption, respectively. Paediatric patients have been reported to experience hyperchloraemic metabolic acidosis or gastrointestinal obstruction. Concurrent administration of acidic drugs may result in their reduced bioavailability. Serious adverse reactions to clofibrate will probably limit its role in the future. Of particular concern are ventricular arrhythmias, induction of cholelithiasis and cholecystitis, and the potential for promoting gastrointestinal malignancy which far outweigh the reported benefits in preventing new or recurrent myocardial infarction, cardiovascular death and overall death. Patients with renal disease are particularly prone to myositis, secondary to alterations in protein binding and impaired renal excretion of clofibrate. Drug interactions with coumarin anticoagulants and sulphonylurea compounds may produce bleeding episodes and hypoglycaemia, respectively. Nicotinic acid produces frequent adverse effects, but they are usually not serious, tend to decrease with time, and can be managed easily. Dermal and gastrointestinal reactions are most common. Truncal and facial flushing are reported in 90 to 100% of treated patients in large clinical trials. Significant elevations of liver enzymes, serum glucose, and serum uric acid are occasionally seen with nicotinic acid therapy. Liver enzyme elevations are more common in patients given large dosage increases over short periods of time, and in patients treated with sustained release formulations.(ABSTRACT TRUNCATED AT 400 WORDS)
 ...
PMID:Adverse effects of hypolipidaemic drugs. 354 4

Juvenile rickets or osteopenia in rural black children is thought to be due to low calcium intake. Characteristic findings include mild calcium deficiency, normal serum phosphate levels, increased alkaline phosphatase concentrations and normal plasma vitamin D levels. The present series consisted of 62 black children (average age 6.82 years), 41 males and 21 females. Low levels of serum calcium and phosphate were present in 34 (54%) and 18 (29%) of the patients respectively. Alkaline phosphatase concentrations were raised (greater than 350 IU/l) in 38 (61%). Serum sodium, potassium, chloride, total bicarbonate, magnesium, ceruloplasmin and albumin levels were generally within normal limits. Urinary acidification was normal and barium studies were reported as normal in all but 4 children. Malabsorption was not an important feature. Serum vitamin D levels were not determined. All 18 patients with hypophosphataemia improved. Eleven children showed no clear response after at least 8 weeks in hospital--8 remained hypocalcaemic and 2 of the 3 patients with normal biochemical values showed no radiological improvement of osteopenia after 2 and 4 months in hospital, while the 3rd showed only very slight improvement after 7 months in hospital. It is not clear why these patients did not respond and whether even longer hospitalisation would have been effective.
 ...
PMID:[Aspects of juvenile rickets/osteopenia in black children]. 360 15

Two patients with extensive tumoral calcinosis were treated with aluminium hydroxide. Initial metabolic studies showed positive calcium and phosphorus balances which became negative with aluminium hydroxide treatment. One subject, who had renal impairment, developed transient hypercalcaemia, parathyroid suppression, low levels of 1,25-dihydroxyvitamin D and calcium malabsorption during treatment with aluminium hydroxide. The second patient developed calcium malabsorption due to vitamin D deficiency. When she was replete with vitamin D there were supranormal levels of 1,25-(OH)2D in the serum and enhanced calcium absorption during treatment with aluminium hydroxide. Both subjects developed hypercalciuria and there was dissolution of many of the calcific tumours. The patient with renal impairment accumulated aluminium in the bone.
 ...
PMID:Tumoral calcinosis: clinical and metabolic response to phosphorus deprivation. 365 64

A premenopausal woman with severe osteoporosis was found to have impaired calcium absorption, without other evidence of intestinal malabsorption. Although circulating levels of 25-OH-vitamin D and 1,25-(OH)2-vitamin D were normal, calcium absorption improved markedly following two weeks of treatment with synthetic 1,25-(OH)2-vitamin D. This suggests that a partial intestinal resistance to the actions of 1,25-(OH)2-vitamin D contributed to the development of her osteoporosis. This case report demonstrates the feasibility of using the calciuric response to a standard oral calcium load to screen for impaired calcium absorption in osteoporotic patients.
 ...
PMID:Premenopausal osteoporosis associated with vitamin D-responsive calcium malabsorption. A case report. 366 94

An 82-year-old woman, with clinically and histologically documented osteomalacia associated with a history of several gastrointestinal operations and malabsorption, was successfully treated with low dose calcitriol. Osteomalacia, with particular reference to the gastrointestinal type, and the role of vitamin D and its metabolites are discussed. Therapy with calcitriol is compared with conventional vitamin D treatment. Calcitriol should be considered in the treatment of osteomalacia induced by gastrointestinal disorders.
 ...
PMID:[Osteomalacia after intestinal operations--therapeutic effect of calcitriol. Report of a case]. 375 50


<< Previous 1 2 3 4 5 6 7 8 9 10 Next >>