共查询到20条相似文献,搜索用时 0 毫秒
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As part of environmental toxicology, it is important to assess both the carcinogenic potential of xenobiotics and their mode of action on target cells. Since dysregulation of ornithine decarboxylase (ODC), a rate-limiting enzyme of polyamine biosynthesis, is considered as an early and essential component in the process of multistage carcinogenesis, we have studied the mode of ODC induction in Syrian-hamster-embryo(SHE) cells stage-exposed to carcinogens and to non-carcinogens. One-stage (5 hr) treatment of SHE cells with 50 microM clofibrate (CLF), a non-genotoxic carcinogen, or with 0.4 microM benzo(a)pyrene (BaP), a genotoxic carcinogen, slightly decreased basal ODC activity. Using the 2-stage exposure, 1 hr to carcinogen, then replacement by TPA for 5 hr, the ODC activity was higher than that obtained with TPA alone. This ODC superinduction was not observed when SHE cells were similarly pre-treated with non-carcinogenic compounds. Several environmental chemicals, pesticides, solvents, oxidizers and drugs were investigated with this SHE cell model. With one-stage exposure, some xenobiotics decreased basal ODC activity, while for others ODC changes were not noticeable. With 2-stage exposure (chemical followed by TPA), all carcinogens amplified the TPA-inducing effect, resulting in ODC superinduction. Comparative studies of the action of carcinogens and of non-carcinogens, using 2-stage exposure protocols, clearly show a close relationship between ODC induction rate and morphological transformation frequency. 相似文献
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The value and effects of treating renal failure by dialysis are analyzed in a series of 84 patients with various types of liver disease. Although none of the 25 patients with cirrhosis survived, six of 50 with fulminant hepatic failure recovered completely as did seven of nine patients with renal failure secondary to extrahepatic biliary tract obstruction or with liver and renal damage following episodes of severe hypotension. Dialysis was required for seven weeks before diuresis occurred in one patient in the latter group. Both peritoneal and hemodialysis satisfactorily controlled plasma urea and creatinine levels, except in patients with fulminant hepatic failure in whom this was only achieved by hemodialysis. Complications of dialysis were most common in patients with cirrhosis and fulminant hepatic failure and included hypotension, gastrointestinal bleeding, and intraperitoneal sepsis. Overall, the results show that dialysis is only worth attempting in those patients in whom recovery of the underlying liver lesion is possible, and even then treatment for prolonged periods may be necessary. 相似文献
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CA Lee 《Canadian Metallurgical Quarterly》1998,12(3):135-144
Fulminant hepatic failure is a serious complication of acetaminophen overdose. The cascade of complications starts with an alert patient that can quickly result in hepatic coma and even death. The nurse completes a poisoning history, provides an antidote, and assesses the extent of hepatic failure from an overdose. This article uses a case study to describe the problems and nursing care for the patient with hepatic failure from acetaminophen overdose. Advanced assessment skills by the critical care nurse enable prompt recognition of postoverdose complications for early intervention and treatment. Acute care nurse practitioners, utilizing the same techniques, can develop protocols for emergency or intensive care units where these patients may be admitted and subsequently cared for. 相似文献
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The most effective treatment for alcoholic liver disease is abstinence from alcohol and it is the only treatment for patients with alcoholic fatty liver. Although many empirical therapeutic agents have been studied in the short-term and long-term treatment of alcoholic hepatitis, results have been mainly inconclusive. To date, only corticosteroids have proved to decrease the short-term mortality rate of patients with severe forms of acute alcoholic hepatitis. Corticosteroids are not beneficial to the majority of patients with mild or moderate forms of acute alcoholic hepatitis; such patients improve with abstinence from alcohol and general supportive measures and do not need a specific short-term treatment. Most long-term trials have only showed that most patients with alcoholic liver disease were neither abstinent nor compliant, and that long-term survival was strongly correlated to abstinence from alcohol. In one study, propylthiouracil decreased the long-term mortality rate of compliant patients with severe alcoholic liver disease who reduced their alcohol intake; however, further clinical trials are needed before propylthiouracil can be recommended. In another study, colchicine decreased the long-term mortality rate of cirrhotic patients, 45% of whom had alcoholic cirrhosis. Results were highly significant, and the need for further clinical trials of colchicine in the long-term treatment of alcoholic and non-alcoholic cirrhosis is imperative. Enteral nutrition should also be studied in severely malnourished cirrhotic patients, since it was shown to decrease the short-term mortality rate of such patients in a recent study. 相似文献
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JR de Leeuw MH Steenks WJ Ros AM Lobbezoo-Scholte F Bosman JA Winnubst 《Canadian Metallurgical Quarterly》1994,21(6):655-666
Psychosocial, socio-demographic and symptom characteristics have been shown to be associated with treatment outcome in patients with craniomandibular dysfunction (CMD). This study was performed to assess to what extent symptoms and correlates of CMD change as a consequence of conservative treatment for CMD. Treatment outcome in a group of CMD patients treated with a stabilization splint (experimental group) was compared with that of a group of patients with CMD who were not treated for CMD (control group). Patients in the experimental group had fewer symptoms of CMD at the end of treatment. However, several symptoms and correlates of CMD also improved in the control group (severity of pain, joint noises, ear symptoms). It was therefore questioned whether all improvements in symptoms and correlates of CMD in the experimental group could be attributed to the treatment received. Results suggest that the main improvement that might be ascribed to therapy was a decrease in 'jaw symptoms'. There was a noticeable decrease in depression and an increased use of 'planned actions and rational thinking' as a coping style in the experimental group whereas these variables did not change in the control group. Implications and suggestions for further research are discussed. 相似文献
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The cost of managing 114 adult haemophiliacs in the west of Scotland was assessed for the period 1 March 1971 to 28 February 1974. Altogether 23 of them (20%) accounted for 80% of the resources used. The cost of hospital treatment of these patients during the period was compared with the predicted cost of home treatment, given the availability of freeze-dried factor VIII concentrate in sufficient amounts. We calculate that adequate on-demand home treatment would cost only 16% more than the present treatment, which is substantially less efficient. 相似文献
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Y Ekrami 《Canadian Metallurgical Quarterly》1976,111(12):1350-1352
This report reviews 21 capsulorrhaphies for for hydatid disease of the liver. At operation, the cysts were intact, with clear fluid, and there was no gross bile oozing in the residual hepatic cavity. The largest amount of normal saline solution that filled a cavity in the right lobe was 650 ml. Only one patient (5%) underwent a second operation 16 days after the first one for infection that developed in a right lobe cavity after capsulorrhaphy. Insertion of a drain secured the recovery in three weeks. In retrospect, retention of a daughter cyst that was recovered at the second operation could account for this complication. The postoperative hospitalization period was eight to ten days for these patients. One can conclude from this experience that capsulorrhaphy has solved the problem of residual cavity provided that the technical points are observed. 相似文献
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OBJECTIVE: The present study was designed to assess the pharmacokinetics of propiverine after single and multiple dosing in patients with and without fatty liver disease. METHODS: The serum concentration-time curves of propiverine and its main metabolite propiverine-N-oxide were investigated in 12 patients with mild to moderate impairment of liver function (mean antipyrine clearance 26.0 ml x min(-1)) and in 12 controls (antipyrine clearance 42.8 ml x min(-1)). Subjects were treated orally with propiverine hydrochloride (Mictonorm) for 5 days (15 mg t. i. d.) to reach steady state. RESULTS: No significant differences were observed for propiverine and its main metabolite with regard to peak serum concentration (Cmax), area under the serum concentration-time curve (AUC) and elimination half-life (t1/2). Adverse events were reported by 12 patients. Five patients with fatty liver disease and seven patients with normal liver function complained of dry mouth and/or blurred vision. All adverse events reported were transient and mild. CONCLUSION: No pharmacokinetic differences relevant for safety were observed, comparing patients with and without fatty liver disease following repeated oral administration of propiverine. Thus there seems to be no need to adjust the dose in patients with mild to moderate impairment of liver function. 相似文献
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P McLoughlin D McKeogh P Byrne G Finlay J Hayes MX FitzGerald 《Canadian Metallurgical Quarterly》1997,52(5):425-430
The purpose of this investigation was to examine if exercise-induced arterial oxyhemoglobin desaturation selectively observed in highly trained endurance athletes could be related to differences in the pulmonary diffusing capacity (DL) measured during exercise. The DL of 24 male endurance athletes was measured using a 3-s breath-hold carbon monoxide procedure (to give DLCO) at rest as well as during cycling at 60% and 90% of these previously determined VO2max. Oxyhemoglobin saturation (SaO2%) was monitored throughout both exercise protocols using an Ohmeda Biox II oximeter. Exercise-induced oxyhemoglobin desaturation (DS) (SaO2% < 91% at VO2max) was observed in 13 subjects [88.2 (0.6)%] but not in the other 11 nondesaturation subjects [NDS: 92.9 (0.4)%] (P < or = 0.05), although VO2max was not significantly different between the groups [DS: 4.34 (0.65) l/min vs NDS: 4.1 (0.49) l/min]. At rest, no differences in either DLCO [ml CO.mmHg-1.min-1: 41.7 (1.7) (DS) vs 41.1 (1.8) (NDS)], DLCO/VA [8.2 (0.4) (DS) vs 7.3 (0.9) (NDS)], MVV [l/min: 196.0 (10.4) (DS) vs 182.0 (9.9) (NDS)] or FEV1/FVC [86.3 (2.2) (DS) vs 82.9 (4.7) (NDS)] were found between groups (P > or = 0.05). However, VE/VO2 at VO2max was lower in the DS group [33.0 (1.1)] compared to the NDS group [36.8 (1.5)] (P < or = 0.05). Exercise DLCO (ml CO.mmHg-1.min-1) was not different between groups at either 60% VO2max [DS: 55.1 (1.4) vs NDS: 57.2 (2.1)] or at 90% VO2max [DS: 61.0 (1.8) vs NDS: 61.4 (2.9)]. A significant relationship (r = 0.698) was calculated to occur between SaO2% and VE/VO2 during maximal exercise. The present findings indicate that the exercise-induced oxyhemoglobin desaturation seen during submaximal and near-maximal exercise is not related to differences in DL, although during maximal exercise SaO2 may be limited by a relatively lower exercise ventilation. 相似文献
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T Matsuishi T Sakai S Nagamitsu H Komori H Iwashita H Kato 《Canadian Metallurgical Quarterly》1994,36(3):441-443
We measured the cerebrospinal fluid (CSF) levels of beta-endorphin in 7 Japanese patients with Joseph disease and compared them with control values. The 7 patients included 4 with type I and 3 with type II disease; their mean age was 45.7 +/- 12.09 years. Diseased controls were matched in age to the patients studied. In these patients, CSF beta-endorphin level was significantly lower than in the controls (40% of normal values). An alteration in CSF beta-endorphin level may explain some of the neurological impairment found in Joseph disease. 相似文献
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P Steindl P Ferenci HP Dienes G Grimm I Pabinger C Madl T Maier-Dobersberger A Herneth B Dragosics S Meryn P Knoflach G Granditsch A Gangl 《Canadian Metallurgical Quarterly》1997,113(1):212-218
BACKGROUND & AIMS: In patients with Wilson's disease presenting with liver involvement, the correct diagnosis is often missed or delayed. The aim of this study was to find an algorithm for diagnosis of this difficult patient group. METHODS: Clinical and laboratory findings of 55 patients with Wilson's disease were evaluated at diagnosis before treatment. Presenting symptom was chronic liver disease in 17 patients, fulminant hepatic failure in 5 patients, hemolysis in 3 patients, and neurological disease in 20 patients, and 10 patients were detected by family screening (siblings). Evaluation included neurological and ophthalmologic examination, routine laboratory tests, and parameters of copper metabolism including liver copper content in 43 liver biopsy specimens. RESULTS: In the whole group, serum ceruloplasmin level was <20 mg/dL in 73%, urinary copper excretion was increased in 88%, and liver copper content was elevated in 91% at diagnosis. Kayser-Fleischer rings were detected in 55%. In contrast to patients with neurological disease (90% Kayser-Fleischer rings, 85% low ceruloplasmin), only 65% of patients presenting with liver disease were diagnosed by these typical findings. Ceruloplasmin levels were lower in patients with Kayser-Fleischer rings or with neurological disturbances than in patients without these symptoms. CONCLUSIONS: The commonly used clinical and laboratory parameters are not sufficient to exclude the diagnosis of Wilson's disease in patients with liver disease of unknown origin. 相似文献