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Biomedical subjects

H Rieder

Publications and source records attributed to H Rieder.

100 records · Page 6Linked to original sources
PubMed1980

[Incidence of bacteremia in heart catheterization: results of a prospective study on the prevention of endocarditis with cefazoline versus placebo].

145 consecutive patients scheduled for a cardiac catheterization were enrolled in a prospective double-blind randomized study to determine the incidence of bacteremia during and following catheterization and the usefulness of antibiotic prophylaxis with cefazolin versus placebo during this procedure. Four blood cultures were taken from each patient to evaluate the incidence of bacteremia vs. contamination. 15 of 296 (5.07%) and 11 of 284 (3.8%) cultures yielded bacteria in the placebo group (74 patients) and in the cefazolin-group (71 patients) respectively. Statistical analysis revealed no significant difference between the groups. These results, together with the spectrum of the organisms isolated and the clinical and laboratory findings, suggest that the isolation of bacteria was due rather to contamination than the result of bacteremia. It is concluded that antibiotic prophylaxis in patients undergoing cardiac catheterization is unnecessary and not indicated.

Blood↗
PubMed1979

NADP-dependent dehydrogenases in rat liver parenchyma. II. Comparison of qualitative and quantitative G6PDH distribution patterns with particular reference to sex differences.

Qualitative histochemical G6PDH distribution patterns obtained in the liver acinus of adult male and female rats with an improved method (Rieder et al., 1978) served as a basis for the isolation by microdissection of tissue samples of defined zonal affiliation. G6PDH activity was assayed quantitatively in tissue samples of zones 1 and 3 by a microfluorometric method, using the oil well technique and enzymatic cycling (Burch et al., 1963; Lowry and Passonneau, 1972). With the use of a correlation system further evidence could be presented for the validity of the recently described qualitative distribution patterns. From a total of 50 analyzed tissue samples the following G6PDH activities were calculated: 4.25 +/- 1.56 U/g dry weight in zone 1 and 2.08 +/- 0.46 U/g dry weight in zone 3 of male and 7.21 +/- 1.03 U/g dry weight in zone 1 and 11.10 +/- 2.56 U/g dry weight in zone 3 of female rats. These data were corrected for interference from the G6PDH activity of the Kupffer cells within zone 1 samples (approximately 80 U/g dry weight), so that the actual relative values for the parenchymal activity could be estimated for the first time: 2 U/g dry weight in zones 1 and 3 of male animals, 5 U/g dry weight in zone 1 and 11 U/g dry weight in zone 3 of female animals. In female livers G6PDH activity in zone 1 is therefore 2.5 times higher, and in zone 3 5 times higher than in the male. These zonal as well as sex-differences are clearly indicative of a heterogeneous functional organization of the liver acinus in terms of capacity for NADPH production, mainly in connection with reductive reactions in fatty acid synthesis.

Animals↗
PubMed1978

NADP-dependent dehydrogenases in rat liver parenchyma. I. Methodological studies on the qualitative histochemistry of G6PDH, 6PGDH, malic enzyme and ICDH.

At present soluble NADP-dependent dehydrogenases are histochemically demonstrated in three different ways: according to the standard method incubation in aqueous media leads to the precipitation of formazan, the formation of which depends entirely on the presence of endogeneous NADPH2-tetrazolium reductases. With the two more recently established methods these reductases are by-passed with the use of intermediate electron acceptors incorporated in the medium. In addition, enzyme diffusion is inhibited either by an increased viscosity of the medium (PVA) or by a semipermeable membrane separating the medium from the section. Depending on the technique applied different distribution patterns have been described. By altering the concentrations of substrates, coenzyme, tetrazolium salt and cytochrome oxidase inhibitor, it was possible to improve both the PVA and membrane methods. Although similar results were obtained, because of its advantages the PVA method is recommended in this report and a detailed description is given. Using the latter for the demonstration of glucose-6-phosphate dehydrogenase (G6PDH), 6-phosphogluconate dehydrogenase (6PGDH), malic enzyme (ME) and isocitrate dehydrogenase (ICDH), characteristic distribution patterns were obtained in the liver parenchyma of male and female rats. For the first time a high G6PDH activity could be demonstrated in nonparenchymal cells which are mainly found in zone 1 of the liver acinus.

Animals↗
PubMedDate not supplied

Sinusoidal endothelial cells from guinea pig liver synthesize and secrete cellular fibronectin in vitro.

Endothelial liver cells were obtained from guinea pig by enzymatic digestion and centrifugal elutriation. Cells were cultured on gelatin and fibronectin pretreated culture vessels. Endothelial cells were characterized by phase-contrast microscopy, electron microscopy and the presence of Factor VIII-related antigen. Fibronectin secretion was determined in cell-free supernatants by a sensitive and specific ELISA and localized on fixed cultured cells by immunofluorescence. [35S]Methionine endogeneously labeled fibronectin was immunoprecipitated from supernatants and cellular lysates and displayed on sodium dodecyl sulfate polyacrylamide slab gel electrophoresis. After attachment to the culture vessel, one day after plating, endothelial cells start to produce fibronectin as measured by ELISA and demonstrated by immunoprecipitation and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Secretion of fibronectin increases as cells proliferate to form a confluent monolayer. By immunofluorescence, fibronectin is visualized inside permeabilized cells and as a fibrillar network on the cell surface. Underneath the cell bodies, fibronectin-positive material is present as short strands. From supernatants and cellular lysates, fibronectin is immunoprecipitated with an apparent Mr of about 235,000 obviously larger than plasma fibronectin with an Mr of 220,000, which behaves electrophoretically like fibronectin isolated from early hepatocyte cultures. As endothelial cells incorporate [3H]fucose in fibronectin, whereas hepatocytes do not, we conclude that endothelial cells in contrast to hepatocytes produce cellular fibronectin. Endothelial cells, therefore, are probably the cellular source of the fibronectin present in the space of Disse. The significance of this finding with respect to fibrotic liver disease is discussed.

Animals↗
PubMedDate not supplied

[Clinical effectiveness and tolerance of auranofin in patients with chronic polyarthritis. Results of a multicenter long-term study].

In an open multicenter trial, 90 patients with rheumatoid arthritis were treated with a daily dose of 6 mg auranofin. The duration of the treatment was 12 months. A significant improvement in the following parameters was observed: grip strength, number of swollen and painful joints after the 4th month, blood erythrocyte sedimentation rate decreased significantly after the 2nd month. Of the 90 patients, 56 (62.3%) completed the therapy, in 14 (15.5%) it was discontinued because of side effects and in 8 (8.9%) because of inefficacy. 12 patients (13.3%) stated other reasons for discontinuing the therapy (non compliance). The reported side-effects were mostly gastrointestinal, especially diarrhoea and loose stools. The evaluation of results referring to the duration of the disease shows that patients with a duration of less than 2 years reacted better to the improvement with auranofin therapy than patients with a longer sickness history.

Adult↗
PubMedDate not supplied

[Value of exercise and sports activities in the elderly].

The sport scientific research within the scope of the first survey of the ILSE-longitudinal study consisted of standardized interviews of 695 probands born between 1930 and 1932. Based upon these interviews will first be presented the connections between physical activities on the one hand and the subjective estimation of health and physical ability on the other. Then a comparison between these subjective estimations and the objective medical opinions will follow. Physical activity has a significantly positive influence on both the subjective estimations and the general attitude towards age and contentment with life. Furthermore the examination provided information on the expectations the elderly link with physical activities, why they possibly refuse to exercise, and under which conditions they might start to exercise. The most important result is the main position of health for the decision in favor of or against physical activities. The statements of the physically active on the exercised sports provide indications of the different interests of men and women and the desired offers.

Activities of Daily Living↗