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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Amino acids 6 (1994), S. 283-293 
    ISSN: 1438-2199
    Keywords: Amino acids ; Chronic renal failure ; Plasma ; Urine ; D-amino acids ; CAPD ; D-Tyrosine ; D-Phenylalanine ; Haemodialysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Total D-amino acids were measured in plasma for 20 non-dialysed patients (creatinine clearance 〈 12 ml/minute), 20 on CAPD, 20 on haemodialysis and 20 normals. Plasma D-tyrosine and D-phenylalanine were measured in 8 of each group by HPLC. Total D-amino acids, D-tyrosine and D-phenylalanine were significantly greater for patients than normals. D-amino acids and D-tyrosine correlated with creatinine and were decreased during HD. During dialysis, the mean losses for D-tyrosine and D-phenylalanine were similar, about 0.2 mg/CAPD exchange and 3 mg/4 hour haemodialysis (i.e. 2% of the total amino acid, as in plasma). Clearance was unaffected by stereochemical configuration. Urinary losses/24 hour in the non-dialysed patients were 0.35 mg D-tyrosine and 0.25 mg D-phenylalanine. Clearance for D-phenylalanine was greater than for the L-enantiomer. Increases in D-amino acids in renal failure are probably due to depletion of D-amino acid oxidase, but may be enhanced by a D-amino acid rich diet, peptide antibiotics and D-amino acid oxidase inhibiting drugs and metabolites. Possible toxic effects need further investigation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Annals of hematology 52 (1986), S. 289-295 
    ISSN: 1432-0584
    Keywords: Lactoglobulins ; Neutrophils ; Plasma ; Radioimmunoassay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This study examines the role of plasma lactoferrin in the assessment of neutropenia. In particular, we have studied lactoferrin as an inhibitor of granulopoiesis and as an indicator of the size of the total blood granulocyte pool (TBGP). Plasma lactoferrin concentration was determined in a heterogeneous group of 30 patients with neutropenia. Serial plasma lactoferrin levels in a patient with cyclic neutropenia correlated with the cycles of the neutrophil count. Patients with splenomegaly had a grossly elevated lactoferrin: neutrophil ratio. Most chronic idiopathic neutropenia patients had no real clinical problems and a normal plasma lactoferrin level. The results provide further evidence to support the concept that plasma lactoferrin indicates the size of the TBGP and the lactoferrin: neutrophil ratio indicates the degree of granulocyte margination. There was no evidence to suggest that lactoferrin acting as a feedback inhibitor of granulopoiesis caused neutropenia in these patients.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 34 (1989), S. 456-461 
    ISSN: 1573-2568
    Keywords: pancreatic enzymes ; chronic pancreatitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The relative efficacy of three commercial pancreatic enzyme supplements in improving fat absorption was studied using the [14C]triolein breath test in 12 patients with chronic pancreatitis. Two of the supplements were enteric coated. The one nonenteric coated product was studied twice: with and without ranitidine coadministration. Doses complied with the manufacturers recommendations. Baseline studies included pentagastrinstimulated gastric acids, 72-hr fecal fat excretion, and [14C]triolein absorption while not on supplementation. Acid outputs were variable (BAO: 0.3–4.1 meq/hr; MAO: 3.5–34.6 meq/hr). Three patients had mild steatorrhea (i.e., 〈10 g/day) and the remaining severe fat malabsorption (56.9±41.5 g/day). Although fat absorption was significantly improved by all three supplements, the nonenteric coated preparation was most effective (P〈 0.001). However, laboratory analysis demonstrated that lipase content was four times greater, ie, 17,000 IU/4 tablets. Pretreatment with ranitidine failed to further improve the absorption in patients given nonenteric supplements but was effective in those found to have high or normal acid outputs (P〈0.001). Our results suggest that the recommended dosage of enteric coated preparations is insufficient for adult patients with severe chronic pancreatitis. Secondly, the marked variability of acid secretion in such patients possibly accounts for the variability of results obtained by others on the usefulness of coadministration of antacids and H2 antagonists. Routine measurement of gastric acid secretion status may help optimize the choice and form of pancreatic enzyme supplementation.
    Type of Medium: Electronic Resource
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