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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Inflammation research 35 (1992), S. 163-169 
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Histamine and other mediators have been shown to be involved in the ethanol-induced jejunal plasma protein loss. In this study we have investigated whether the histamine (H)-related component of this protein loss is mediated by H1-receptors, H2-receptors or both. Four groups of dogs (n=12 in each) were studied. They were: untreated, H1+H2-receptor blockade, H1-receptor blockade and H2-receptor blockade. Chlorpheniramine and ranitidine were used to block H1 and H2-receptor blockade. Chlorpheniramine and ranitidine were used to block H1 and H2-receptors respectively. In all animals, jejunal protein loss was measured over 10 min periods for 90 min. Ethanol increased protein loss in all time periods (p〈0.001). This protein loss was depressed by H1+H2-receptors blockade throughout 90 min (p〈0.01). H1-receptor blockade caused a similar depression of ethanol effect but only during 20 to 40 min (p〈0.05). In contrast, H2-receptor blockade aggravated the protein losing effect of ethanol throughout 90 min (p〈0.01). Analyses of data tend to suggest that the ethanol-induced protein loss is mediated principally by H1-receptors, and that a complete inhibition of the histamine-related ethanol-induced protein loss can be achieved only by a simultaneous blockade of both H1 and H2- receptors, and not by H1- or H2-receptor blockade alone.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 33 (1988), S. 1418-1424 
    ISSN: 1573-2568
    Keywords: intravenous isoproterenol ; splanchnic ; nonsplanchnic blood flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this study we investigated the relative vascular response of different locations of the gastrointestinal tract to continuous intravenous infusion of isoproterenol (0.1 μgkg−1 min−1 for 10 min). The vascular response of some nonsplanchnic organs was also examined. Blood flow of the arteries was measured by electromagnetic flowmetry and that of the tissues by 15-μm microspheres. Isoproterenol increased (P〈0.05) blood flow of the axillary artery (+52%), and the superior mesenteric artery (+45%), but not that of the inferior mesenteric artery. In the nongastrointestinal tissues, isoproterenol increased (P〈0.05) the blood flow of the left (+46%), and right ventricle (+85%), and the skeletal muscle (+100%). In the gastrointestinal tract, isoproterenol increased (P〈0.05) blood flow in the esophagogastric junction (+505%) and antrum (+1511%) only, but not in the gastric body or in any location of the small or large intestine. The drug also caused a large fall in resistance in the esophagogastric junction (−74%) and antrum (−94%), and a small, but significant fall in the duodenum, jejunum, and in the mid-small intestine. It had no significant effect on vascular resistance in the gastric body, ileum, or colon. In those locations of the gastrointestinal tract where isoproterenol caused an increase in blood flow, this effect was confined to the combined mucosal plus submucosal layer, and the drug had no effect on the muscularis. These data suggest that different locations of the gastrointestinal tract respond differently to the same circulating concentration of isoproterenol. The mechanism of this difference in response merits further investigation.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 41 (1996), S. 2461-2470 
    ISSN: 1573-2568
    Keywords: superoxide dismutase ; catalase ; allopurinol ; oxypurinol ; CD18
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Previous reports indicate that intestinal intraluminal ethanol increases mucosal permeability (an index of mucosal injury) and histamine release by mast cells, and that the released histamine plays a role in mediating the increased permeability. In the present study, we investigated whether reactive oxygen metabolites and their major sources (xanthine oxidase and leukocytes) were involved in these ethanol effects. In rabbits, segments of the jejunum were perfused with a control solution or with 6% ethanol. In these segments, mucosal permeability was assessed by determining jejunal clearance of i.v. administered51Cr-ethylenediaminetetraacetate (51Cr-EDTA) and125I-bovine serum albumin (125I-BSA), and mast cell histamine release was estimated from the histamine concentration of the gut effluent. Ethanol increased51Cr-EDTA clearance,125I-BSA clearance, and histamine release. These ethanol effects decreased when the animals were given superoxide dismutase plus catalase (scavenger of O2− and H2O2, respectively), allopurinol, or oxypurinol (xanthine oxidase inhibitors). Administration of a monoclonal antibody (R15.7) against leukocyte adhesion molecule, CD18, inhibited completely the ethanol-induced increased51Cr-EDTA and125I-BSA clearances and histamine release. These and supplementary data suggest that (a) ethanol-induced mucosal injury and mast cell histamine release are mediated primarily by leukocytes, and (b) oxy radicals, especially those generated by xanthine oxidase, mediate these ethanol effects mainly by promoting leukocyte infiltration.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 38 (1993), S. 795-802 
    ISSN: 1573-2568
    Keywords: chest pain ; Holter electrocardiography ; esophageal dysmotility ; gastroesophageal reflux
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Standard Holter electrocardiographic (ECG) monitoring was combined with ambulatory esophageal manometry and pH-metry in 25 patients with atypical chest pain in order to determine whether an association could be found between spontaneous pain episodes and ischemic ECG changes or esophageal dysfunction. Results of ambulatory testing were compared to those obtained with standard esophaeal manometry and provocative testing. Twenty-two of the 25 patients experienced a total of 88 pain episodes during ambulatory testing. Although 15 of the 22 patients (68%) experiencing pain during testing had at least one pain episode that corelated temporally with gastroesophageal reflux, esophageal dysmotility or ischemic ECG changes, 65% of all pain episodes were unrelated to abnormal esophageal events or ECG changes. Seventeen percent of pain episodes were associated with gastroesophageal reflux, 15% with esophageal dysmotility,and 2% with a combined acid reflux and esophageal dysmotility event. Only one pain episode was associated with ischemic ECG changes. Twelve of the 15 patients with chest pain episodes associated with reflux or esophageal dysmotility had othe identical pain episodes in which there was no correlation. Reproduction of a patient's pain during standard manometry with provocative testing did not predict a strong correlation between the patient's spontaneous pain episodes and esophageal dysfunction during ambulatory recordings. In summary, patients with atypical chest pain have relatively few spontaneous pain episodes that correlate with gastroesophageal reflux, esophageal dysmotility, or ischemic ECG changes. It appears that different stimuli can trigger identical episodes of chest pain, which suggests that many of these patients may have dysfunction of their visceral pain sensory mechanisms.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 26 (1981), S. 23-32 
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Acute exposure of jejunal mucosa to ethanol has been reported to produce a depression of transmural glucose transport across this organin vitro andin vivo. In an attempt to understand the mechanism of action of ethanol on intestinal transport, in the present study we have investigated the effect of ethanol on glucose uptake by purified brush-border membrane vesicles of hamster jejunum. Ethanol, in concentrations found in man after moderate drinking (1–5% w/v), was found to depress glucose uptake by the brush-border membrane in a dose-dependent and time-dependent manner. Mannose was used to measure nonspecific uptake, and we found that the ethanol-induced depression of glucose uptake was not related to an alteration of the nonspecific uptake of this sugar. The inhibition of glucose uptake of the ethanol-treated membranes completely disappeared after repeated washing of the membranes with ethanol-free buffer. Accordingly, the ethanol-induced depression of glucose uptake was not the result of irreversible damage to membrane proteins but was related to a direct effect of ethanol on the brush-border membrane. On the basis of these findings, it is concluded that a direct interference with glucose translocation across the brush border plays an important role in the ethanol-induced depression of transmural jejunal glucose absorption.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-2568
    Keywords: indium-111 ; leukocyte ; imaging in inflammatory bowel disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study was designed to evaluate the role of111In-labeled leukocyte imaging and fecal excretion in the assessment of inflammatory bowel disease. We compared these tests to various indices of disease activity in Crohn's disease, to Truelove's grading in ulcerative colitis, and to endoscopy, x-ray, and pathology in both diseases. Eleven controls, 16 patients with Crohn's disease, 13 with ulcerative colitis, and 3 with other types of acute bowel inflammation were studied (positive controls). Indium scanning was performed at 1,4, and 24 hr. Fourteen of 16 patients with active Crohn's disease had positive scans but in only five was localization accurate. One patient had inactive ulcerative colitis, and the scan was negative. Of 12 patients with active ulcerative colitis, 10 had positive scans but disease localization was accurate in only four. Disease extent was correctly defined in 1 of the 3 Positive Controls. There was no significant difference in the accuracy of scanning at 1,4 or 24 hr.111In fecal excretion was significantly higher in patients with inflammatory bowel disease than in controls, and there was correlation between111In fecal excretion and most of the indices of disease activity in Crohn's disease. In ulcerative colitis,111In fecal excretion did not correlate with Truelove's grading but reflected colonoscopic assessment of severity. In conclusion,111In-labeled leukocyte scanning lacks sensitivity with respect to disease extent, but fecal excretion of111In correlates well with disease severity as determined by other methods.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 32 (1987), S. S26 
    ISSN: 1573-2568
    Keywords: infection ; disease activity ; nutritional state ; malabsorption ; Crohn's disease activity indices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Presently there are no specific laboratory tests to diagnose inflammatory bowel disease (IBD). Nonspecific tests to differentiate diarrhea due to mucosal injury from that occurring in patients with normal bowel mucosa (eg, fecal occult blood, leukocytes, etc) are not helpful. Tests to exclude infectious agents are very important, since the clinical and radiological appearance of these may mimic IBD, and patients with IBD may suffer from superinfection. There are no laboratory tests which can differentiate Crohn's colitis from ulcerative colitis (UC). The tests used in the assessment and management of severely ill patients (Hgb, WBC, electrolytes, etc) are important, since abnormalities need to be corrected on an ongoing basis. The tests used to assess nutritional status are of little clinical value, since “clinical assessment” is as good as the laboratory assessment. Estimation of disease activity by tests is rarely better than the juudgment of the clinician. Workup for malabsorption in Crohn's disease and the assessment of absorptive capacity of the terminal ileum are important for proper planning of management. Laboratory tests are also useful in clarifying the nature of some complications (eg, anemias and joint diseases).
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 13 (1968), S. 222-233 
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The present study was prompted by the need for an accurate method by which the speed of propulsion of gastrointestinal contents could be assessed. The transit time of a single injection of an indicator substance in a segment of human jejunum in vivo was determined with radio-Renografin-125I and phenolsulfonphthalein as markers. The markers were nonabsorbable and mixed satisfactorily with intestinal contents over a 25-cm. segment of jejunum. The peak concentration time is proposed as a more representative and practical value of the transit time in the gastrointestinal system than the mean transit time. This opinion is based on (1) the dissimilarities between the cardiovascular and gastrointestinal systems—namely, the slow flow rate and the presence of considerable cephalad transport in the gastrointestinal tract; (2) statistical correlation between appearance time, peak concentration time, and mean transit time; and (3) the simplicity and speed of determination of the peak concentration time.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Conclusions In an attempt to clucidate the pathophysiology of the postgastrectomy dumping syndrome, iso-osmotic solutions (1682 mosm./L.) of glucose and of D(+)xylose were given by intrajejunal infusion in 6 subjects with an intact stomach and orally to 7 postgastrectomy patients. Symptoms developing after administration of glucose (predominantly vasomotor) lasted longer but were more tolerable than those experienced after D(+)xylose (predominantly gastrointestinal) . D(+)xylose induced less hypokalemia and milder ECG changes, a slight increase in blood-sugar levels (without late hypoglycemia), and a prolonged osmotic effect, as evidenced by protracted changes in plasma volume and osmolarity, total serum solids, and hematocrit. Subjects with an intact pylorus appeared to be most sensitive; patients who had not experienced dumping after partial gastrectomy were relatively more resistant to either sugar; and those who had had spontaneous symptoms postoperatively experienced more abdominal cramps and diarrhea after D(+)xylose provocation but otherwise had symptoms identical with those of spontaneous episodes. D(+)xylose, a sugar which is not insulin-dependent, can induce symptoms in persons with an intact stomach as well as in gastrectomized patients subject to spontaneous dumping—a finding which negates the hypothesis that disturbance in carbohydrate metabolism or “exhaustion ” of the islets of Langerhans is the cause of this condition. The role of endogenous insulin after glucose provocation and the mechanism of tolbutamide action in dumping have been discussed.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 18 (1973), S. 757-766 
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A method of converting analog esophageal pressure and transmural potential difference records to standardized coded digital data is described. Data thus compiled can be analyzed by computer methods to yield: a) simplified plots of baseline pressures and potential difference for rapid visual analysis, and b) the calculated characteristics of the sphincters. The digital data, when stored, provide a bank of information readily available for comparative investigation of groups of records.
    Type of Medium: Electronic Resource
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