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Biomedical subjects

T Jávor

Publications and source records attributed to T Jávor.

At least 19 recordsLinked to original sources
PubMed1992

[Hepatitis virus (HBV, HCV, HDV) markers in chronic liver diseases. Comparative studies in two East-Central European countries].

The prevalence of hepatitis virus markers in patients with chronic liver diseases from two countries has been studied: 68 patients (38 alcoholic hepatitis or cirrhosis, 30 chronic HBsAg-positive hepatitis) from Hungary as well as 109 patients (55 alcoholic liver disease, 45 chronic hepatitis or cryptogenic cirrhosis and 9 hepatoma) from Romania were examined for HBsAg, anti-HBs, anti-HBc, anti-HCV and anti-HDV, using the corresponding Abbott Elisa test systems. In alcoholic liver disease HBsAg occurred in 6/38 patients from Hungary and in 22/55 patients respectively, that is HBV markers occurred with significantly higher frequency in alcoholic patients from Romania (p less than 0.05). In the Hungarian group a total of 36 patients were HBsAg positive and out of them 5 had anti-HDV (13.9%), while out of 21 Romania HBsAg carriers 10 patients had anti-HDV (47.6%). Among 9 hepatoma patients 4 had HBsAg, 6 anti-HBs and 7 anti-HBc and 4 had anti-HCV and 3 had anti-HDV. One patient with hepatoma had both HBsAg and anti-HCV plus anti-HDV as well. Results suggest that the infection with hepatitis viruses in alcoholic liver diseases is more common in Romania than in Hungary, and the prevalence of delta virus infection in HBV carriers is also significantly higher in Romania than in Hungary.

Biomarkers↗
PubMed1992

Mechanisms of vagal nerve in gastric mucosal defense: unchanged gastric emptying and increased vascular permeability.

Gastric cytoprotection in response to different agents (prostaglandins, carotenoids, etc.) failed to occur after surgical vagotomy. Decreased gastric emptying and the increased vascular permeability were tested in ethanol-treated rats without and with bilateral surgical vagotomy. The experiments were carried out on Sprague-Dawley rats. The animals were fasted for 24 h before experiments. Bilateral surgical vagotomy or only laparatomy were carried out at 30 min before administration of ethanol (96%, 1 ml). The animals were killed at 0, 1, 5, 15, and 60 min after ethanol administration, when the number and severity of gastric mucosal lesions were noted. In another series of experiments, the animal received Evans blue (1 mg/100 g) i.v. 15 min before killing. The gastric contents were collected and the glandular mucosa was scraped. Evans blue was extracted in chloroform, and its concentration was spectrophotometrically measured. It has been found that (a) both number of lesions and severity of ethanol-induced gastric mucosal damage were larger at each time period in surgically vagotomized rats than in rats with intact vagal nerves; (b) the increased vascular permeability was significantly higher in gastric mucosa at an early period in surgically vagotomized rats compared to rats with intact vagal nerve; (c) the increased vascular events preceded the development of macroscopic appearance of gastric mucosa damage in both groups of animals; and (d) the time-related responses were the same in both groups of animals. It is concluded that increased vascular permeability, but not gastric emptying, probably has some role in the failure of the development of gastric cytoprotection in surgically vagotomized rats.

Animals↗
PubMed1992

Measurement of non-steroid antiinflammatory drugs induced gastric microbleeding.

The damage of the mucous membranes in the gastrointestinal tract caused by non-steroid antiinflammatory drugs are well known. The gastrointestinal microbleeding was measured by the method of Fischer and Hunt before and after the intake of indomethacin (4 x 25 mg), naproxen-sodium (4 x 275 mg), diclofenac (3 x 50 mg) and azapropazone (2 x 600 mg). In the indomethacin group microbleeding increased from 0.91 +/- 0.12 ml/24 h to 7.30 +/- 1.20 ml/h. In the naproxen-sodium group from 1.22 +/- 0.16 ml/24 h to 3.56 +/- 0.40 ml/24 h, in the diclofenac group from 0.86 +/- 0.14 ml/24 h to 3.18 +/- 0.28 ml/24 h, in azapropazone group from 0.92 +/- 0.18 ml/24 h to 2.50 +/- 0.20 ml/24 h, respectively. All non-steroid antiinflammatory drugs increased the gastric microbleeding, however, there were considerable differences in the degree of enhancement. This can be explained by the different inhibitory activities of the drugs on the cyclooxygenase enzyme activity.

Adult↗
PubMed1992

Clinical evidence of hepatoprotection induced by ursodeoxycholic acid.

Ursodeoxycholic-acid (UDCA) was introduced to the clinical practice as an effective agent for the dissolution of gallstones. The efficacy of UDCA was proved recently in the treatment of patients with chronic cholestatic liver disease. We demonstrate the hepatoprotective effect of UDCA in a patient with chronic cholestatic liver disease. A sixty-nine years old male patient was admitted to our department with severe jaundice. The laboratory and radiologic examinations revealed significant cholestasis without any morphological alterations. Among the serological tests the anti-HCV antibody was positive. Based on these findings and anamnestic data (no blood transfusion and/or operation), sporadic chronic C virus hepatitis was assumed with dominant cholestasis. The corticosteroid therapy even in high doses was ineffective, the liver function parameters worsened. Later UDCA (Ursofalk, Falk Pharma) was given at a dose of 250 mg three times daily. Clinical improvement was seen after the first week of UDCA treatment. The patient's complaints relieved parallel with decrease of serum bilirubin, gamma-glutamyl transferase and transaminase levels. These parameters showed further decrease during the treatment.

Aged↗
PubMed1991

Failure of prostacyclin, beta-carotene, atropine and cimetidine to produce gastric cyto- and general mucosal protection in surgically vagotomized rats.

Different chemicals (such as ethanol, HCl, drugs) produce gastric mucosal injury. A special type of gastric mucosal defense, which differed from the inhibition of gastric acid secretion, was discovered in response to small doses of prostaglandins. This phenomenon was termed "gastric cytoprotection". Later, the existence of gastric cytoprotection was proved using different compounds, such as vitamin A and other carotenoids, prostacyclin, small doses of anticholinergic and H2-blocking agents. These compounds produce cyto-protection by different mechanisms. In this study we tested the role of vagus nerve on the development of these different types of gastric cytoprotection. These compounds prevent ethanol-induced gastric mucosal injury in rats with intact vagus nerve, but their cyto- and mucosal protective effects disappear in surgically vagotomized rats. These results indicate that the intact vagus nerve is basically necessary for the overproduction of HCl and pepsin secretion, and for the development of gastric cytoprotection, produced by different compounds (e.g. prostacyclin, beta-carotene, small doses of atropine and cimetidine) acting without the presence of inhibition of gastric acid secretion.

Animals↗
PubMed1990

[Hemorheologic parameters during the 6 months following myocardial infarct].

It is verified that rheological factors play a role in the pathomechanism of ischemic heart disease (IHD) and acute myocardial infarction (AMI). The changes of the rheological parameters (whole blood and plasma viscosity, fibrinogen level, hematocrit) of 17 patients (mean age: 59 years) were studied in the first six months after AMI. The measurements were carried out after the admission, before the discharge from the hospital and at the control examinations after one and six months. A slight increase of hematocrit and whole blood viscosity was found during the six months follow up period which was statistically significant concerning the hematocrit (p less than 0.05). As the part of the control examination exercise stress test was performed. Among the rheological parameters hematocrit and whole blood viscosity of those who showed myocardial ischemia during the test were significantly worse (p less than 0.05) comparing to the non ischemic group. These results underline the role of hemorheological parameters as risk factors in these diseases.

Blood Flow Velocity↗
PubMed1990

[Multistep prognosis in acute myocardial infarction using the PRIMA method (Pattern Recognition by Independent Multicategory Analysis)].

Authors analysed the possibilities of in-hospital prognosis made of patients with acute myocardial infarction by using information obtained during admission. Eighty eight patients with transmural myocardial infarction (not older than 70 years and the prehospital delay shorter than 24 hours) were analysed. On the basis of the hospital events they were divided into 3 classes: (a) uneventful (16), (b) complicated (55) and (c) lethal (17). The initial 26 data available in the first hour were analysed by PRIMA pattern recognition method adapted to ROSY--80B microcomputer. 3 days later the 3 class distances of the initial PRIMA analysis together with the 21 new data of the remaining 79 patients were analysed again. The third analysis (66 patients) was made between the 4th and 6th days after a successful mobilization. The last analysis (44 patients) was performed just before the discharge of the patients, who were able to carry out the low-level and submaximal ergometric tests. The average effectiveness of the method gradually improved during hospitalization from 80% to 91%. The recognition ability of each class respectively was 57% for (a) uneventful, 82% for (b) complicated, and 95% for (c) lethal initially, and it has improved finally: 82% for uneventful, 94% for complicated cases.

Female↗
PubMed1990

[Hormonal changes during administration of dietary fibers in patients with decreased glucose tolerance].

The authors carried out a self-controlled study using 11, non-obese patients with impaired glucose tolerance. The first day an oral glucose tolerance test was performed as a control. This was repeated the next day with a simultaneous intake of 20 g natural wheat bran. On both days blood samples were taken at 30 minute intervals (for three hours period) after glucose or glucose plus bran ingestion to measure the plasma sugar, insulin, C-peptid, gastrin and glucagon levels. It has been found that: 1. With simultaneous bran intake the blood glucose levels were decreased as compared to the control values. 2. The serum insulin, and C-peptid levels were similar in both tests. 3. The glucagon response curve fell below that of the control. 4. The serum gastrin levels did not show any change following either glucose or glucose plus bran intake. It has been concluded, that the dietary fibres are able to decrease of glucagon release, beside their direct inhibitory effect on the level of sugar absorption from gastrointestinal tract.

Blood Glucose↗
PubMed1990

[Hemorrheologic parameters in myocardial infarct during the hospitalization phase].

The changes of the rheological parameters (whole blood and plasma viscosity, fibrinogen level, red cell count, hematocrit) of 22 AMI patients (mean age: 59 years) were studied during the hospital phase of acute myocardial infarction. The measurements were carried out after the admission, after the beginning of the mobilization and before the discharge from the hospital. Looking at the results of all of the patients they could not find any statistically significant change, although in the first phase improving hemorheological parameters were measured and this way the discharge values were similar to the admission ones. In men significantly worse starting values were found than in women and the deterioration of these parameters in their group was also expressed. The deliberate use of diuretics and the administration of high dose nitroglycerin may be one part of the less worsening rheological parameters in comparison with the literature.

Blood Viscosity↗
PubMed1990

A biochemical and pharmacological approach to the genesis of ulcer disease II. A model study of stress-induced injury to gastric mucosa in rats.

Biochemical and molecular pharmacological studies were carried out in the gastric fundic mucosa during the development of stress ulcer in rats. The aims of this study were: (1) to evaluate the changes in membrane-bound ATP-dependent energy systems during the development of stress ulcer; (2) to prove (or to exclude) the presence of tissue hypoxia in the rat gastric mucosa during the development of stress ulcer; (3) to obtain further evidence of the existence of a feedback mechanism between ATP-ADP, ATP-cAMP, and cAMP-AMP transformations during the development of stress ulcer; (4) to analyze the different biochemical changes in the gastric mucosa before and after the macroscopic appearance of stress-induced gastric mucosal lesions (ulcers). The observations were carried out on both sexes of CFY-strain rats of 180 to 210 g body weight. The animals were deprived of food for 24 hours before the experiments. The animals were forced to swim in water (at 24 degrees C) for five hours. They were sacrificed at 0, 1, 2, 3, 4, and 5 hours after the introduction of stress. The tissue levels of ATP, ADP, AMP/ADP, and lactate were enzymatically measured; the cAMP was measured by radioimmunoassay. The adenylate pool (ATP + ADP + AMP), ratio of ATP/ADP, and "energy charge" [(ATP + 0.5 ADP)/(ATP + ADP + AMP)] were calculated. The membrane (Mg2(+)-Na(+)-K(+)-dependent) ATPase was prepared from the rat gastric fundic mucosa. Dose-response curves for epinephrine, cAMP, and AMP were determined on Na(+)-K(+)-dependent ATPase; also, the affinity, intrinsic activity curves, pD2, pA2 and alpha were calculated for all components. It was found that: (1) gastric mucosal lesions appeared and increased gradually from three hours after introduction of stress; (2) the extent of ATP-cAMP and cAMP-AMP transformations was increased considerably during the development of stress ulcer; (3) the extent of ATP-ADP transformation was completely inhibited; (4) the activity of Na(+)-K(+)-dependent ATPase from rat gastric fundic mucosa could be inhibited by epinephrine, cAMP, and AMP; (5) the ratio of ATP/ADP was unchanged in the first time period (from 0 to 3 hours), after which its value increased; (6) the value of "energy charge" (e.g., the extent of phosphorylation and/or dephosphorylation) of cells was decreased at two and three hours, after which its value returned to a normal level; (7) there was no increase in the tissue level of lactate; (8) several biochemical changes (decrease of ATP, ADP, "energy charge," increase of cAMP, AMP) preceded the macroscopic appearance of stress ulcer.(ABSTRACT TRUNCATED AT 400 WORDS)

Adenosine Monophosphate↗
PubMed1990

Effects of a novel Hungarian antacid containing Al and Mg (Tisacid) on mucosal prostaglandin generation and oxygen free radicals in normal rats.

A new patented chemical agent (Al-Mg-hydroxy-carbonate; acid-binding capacity greater than 30 mmol/g) was produced by our work-team. After our preliminary pharmacological and some prospective, randomized, multicentre, controlled clinical studies, this antacid was registered (Tisacid tablet and suspension; Alkaloida, Hungary). A cumulative ulcer healing rate of 80-85% was proved by Tisacid monotherapy applied in low doses (from 80 to 160 mmol/day) in patients with duodenal ulcer. The aims of this study were: (i) to determine the role of different antacids on the genesis of mucosal prostaglandins (PGs) (PGE2 and 6-keto-PGF1 alpha) in normal rats; (ii) to evaluate the effects of indomethacin pre-treatment (20 mg/kg b.w.,s.c.) on the Tisacid-induced alterations of gastric mucosal PG-contents; (iii) to analyse the generation of oxygen free radicals and lipid peroxidation in the rat oxyntic mucosa by the application of different doses of Tisacid (activities of CAT, GSH-px and SOD, contents of MDA and red. GSH). It was found that: Tisacid has a potent gastroproprotective effect in gastric mucosa, via (a) an increase in the mucosal levels of PGs, and (b) a scavenging-like effect in normal rat gastric mucosa. It is concluded that the gastroprotective effect of Tisacid appears because of the following: (i) excellent acid-neutralizing capacity; (ii) mucosal generation of PGs (PGE2 and PGI2); (iii) free radical scavenging; (iv) its possible activity as a Ca-antagonist (Mg-containing compound).

6-Ketoprostaglandin F1 alpha↗
PubMed1990

Pattern recognition in evaluation of haemorheological and haemodynamical measurements in the cardiological diagnostics.

The non-invasive differential diagnosis of ischaemic heart disease (IHD) and acute myocarditis or secondary cardiomyopathy following myocarditis can be difficult on the basis of the complaints, resting and exercise ECG and nuclear cardiological tests. 92 patients (mean age: 46 years) in the first step and 100 patients (mean age: 44 years) in the second step all with heart troubles, were examined. Besides determination of the routine parameters, nuclear haemodynamical and haemorheological measurements were carried out. Then each group of the patients was classified into 4 subgroups: 1) myocardial infarction /n:9/, 2) IHD /52/, 3) myocarditis /28/, 4) chronic cor pulmonale (CCP) /3/ subgroups in the first group and 1) normal /n:20/, 2) IHD /50/, 3) myocarditis /16/, 4) chronic cor pulmonale /14/ subgroups in the second group. The patients were reclassified by our multivariate pattern recognition algorithm (PRIMA). The average effectiveness of our method was over 80%, the recognition abilities for the subgroups (classes) ranged between 71 and 100%. An analysis of the discrimination power of the properties has made it evident that the haemorheological features were more characteristic than the haemodynamic ones in distinguishing the two differential-diagnostically critical groups. Our results show that our multivariate statistical method can be useful for the computer-aided decision in cardiological diagnostics.

Acute Disease↗