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Страна 1 од 75 резултати
Measurement of occult upper gastrointestinal tract blood loss: a direct comparison of radiochromium and haem-porphyrin assay techniques.
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Faecal haem-porphyrin assay by the HemoQuant method has many practical advantages over the well-validated, radiochromium (51Cr-tagged red cell) method for measuring gastrointestinal blood loss. Because haem may be absorbed but the chronic ion is not, the two measures were directly compared in
Gastrointestinal blood loss after non-steroidal anti-inflammatory drugs. Measurement by selective determination of faecal porphyrins.
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1. A method for the detection of gastrointestinal blood loss based upon the selective measurement of faecal porphyrins was tested in two studies in healthy volunteers. 2. In the first study subjects (n = 6) received intragastric autologous blood (saline, 2 and 6 ml as a single dose) resulting in a
Isolation of an X-factor-dependent but porphyrin-positive Escherichia coli from urine of a patient with hemorrhagic cystitis.
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An Escherichia coli isolate was recovered from a 92-year-old female patient with urinary tract infection. Gram-stained preparation of the urine sediment manifested some gram-negative rod-shaped cells, and the urine specimen culture yielded nonhemolytic colonies on sheep blood agar plate. However, no
Assessment of faecal occult blood loss by qualitative and quantitative methods.
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BACKGROUND
Various methods exist for the assessment of faecal occult blood loss in a patient with suspected gastrointestinal blood loss.
METHODS
The present study examined the effectiveness and financial implications of a qualitative guaiac-based method (Haemoccult) of faecal occult blood detection
Effect of cimetidine on aspirin-induced gastric hemorrhage in dogs.
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Efficacy of cimetidine in the prevention of aspirin-induced gastric hemorrhage was evaluated, using 4 groups of 6 dogs given: Group 1--controls; group 2-7.5 mg of cimetidine/kg of body weight every 8 hours; group 3-7.5 mg of cimetidine/kg every 8 hours and 35 mg of nonbuffered aspirin/kg every 8
Detection of occult upper gastrointestinal tract bleeding: performance differences in fecal occult blood tests.
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OBJECTIVE
To compare rates of detection of occult upper gastrointestinal (GI) tract bleeding by guaiac (Hemoccult II [HO]), immunochemical (HemeSelect [HS]), and heme-porphyrin (HemoQuant [HQT]) fecal occult blood tests. PATIENTS, SUBJECTS, AND METHODS: In a cross-sectional study to detect native
Measurement of degraded fecal hemoglobin-heme to estimate gastrointestinal site of occult bleeding. Appraisal of its clinical utility.
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Hemoglobin-heme is variably converted to porphyrin during enterocolic transit. This intestinal converted fraction, as measured by HemoQuant, was elevated as a predictor of the occult bleeding site in 152 patients with discrete lesions. The intestinal converted fraction, expressed as the percentage
Acute intermittent porphyria presenting with a subarachnoid haemorrhage.
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A 47-year-old man presented with abdominal pain, neck stiffness, severe transient hypertension and unusually dark urine. Cerebrospinal fluid investigations and angiography confirmed the diagnosis of a subarachnoid haemorrhage. Porphyrin studies on the patient and his family demonstrated that the
Evaluation of HemoQuant test and enteroclysis in estimating the sites of obscure gastrointestinal bleeding.
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The HemoQuant test includes the measurement of total fecal hemoglobin (Hb) or porphyrin derived from heme, and of intestinal converted fraction (ICF) which is the performed porphyrin probably by bacteria during enterocolic transit. The mean +/- SD of HemoQuant in 31 healthy subjects was 0.57 +/-
Heme oxygenase 1 plays role of neuron-protection by regulating Nrf2-ARE signaling post intracerebral hemorrhage.
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The NF-E2 related factor 2 (Nrf2) could be activated in intracerebral hemorrhage (ICH), and trigger the expression of ARE regulated heme oxygenase 1 (HO-1) subsequently. This study aims to explore neuroprotection of HO-1 protein in regulating the Nrf2-ARE signaling pathway in ICH. In this study, the
Gastrointestinal blood loss from a new buffered aspirin (Ostoprin): measurement by radiochromium and Hemoquant techniques.
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Occult gastrointestinal blood loss induced by a new buffered aspirin preparation (Ostoprin, 4.0 g per day) was compared with that from an enteric-coated aspirin (Ecotrin, 3.9 g per day) in 40 patients with osteoarthritis. Blood loss was measured by the radiochromium method and compared with the
Microvascular oxygen pressure in the pig intestine during haemorrhagic shock and resuscitation.
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1. The aim of this study was to investigate the relation between microvascular and venous oxygen pressures during haemorrhagic shock and resuscitation in the pig intestine. To this end microvascular PO2 (microPO2) was measured by quenching of Pd-porphyrin phosphorescence by oxygen and validated for
Porphyrin-linked nitroimidazole antibiotics targeting Porphyromonas gingivalis.
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Periodontal disease is an inflammatory process affecting supporting tissues surrounding the teeth. The anaerobic gram-negative bacterium Porphyromonas gingivalis is implicated in the disease. This organism requires the uptake of porphyrins most apparently as haem 1 from local haemorrhage and it has
Haem in the gut. Part II. Faecal excretion of haem and haem-derived porphyrins and their detection.
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Only a fraction of haem (ferroprotoporphyrin) finding its way into the gut lumen is absorbed; the major portion enters the colon. There, unabsorbed haem, together with any haem of haemoproteins shed directly into the colonic lumen as haemoglobin or other haemoproteins, are converted by bacteria to a
Quantitative measurement of faecal blood loss: comparison of radioisotopic and chemical analyses.
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Blood loss in faeces was assessed by three different methods in five patients with recurrent iron deficiency. In short term (12 day) studies chemical analysis of complete stool collections for haemderived porphyrins (HemoQuant) gave results closely correlated with those obtained by measuring stool
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