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  • 1
    ISSN: 1432-1920
    Keywords: Key words Aneurysm ; intracranial ; Haemorrhage ; subarachnoid ; Aneurysm ; de novo ; Risk factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Although aneurysms are widely considered to be of congenital origin there is still debate as to whether some at least might be formed de novo during life. A review of all 49 reported cases plus one previously unpublished case reveals common clinical features and might aid in the management of this group of patients. Statistical analysis of all 50 cases of de novo aneurysms discloses a more frequent history of smoking (P = 0.0007) and arterial hypertension (P = 0.0026) than in a control cohort. Patients with de novo aneurysms are younger (P 〈 0.0001); the proportion with multiple aneurysms was 28 %. Of de novo aneurysms 44 % became symptomatic 3–6 years after the first subarachnoid haemorrhage (SAH), and the interval was significantly shorter in hypertensive patients. We suggest that young patients with a history of SAH and arterial hypertension and nicotine abuse should therefore be considered for conventional angiography after a 5-year interval. MRA might not be useful due to clip artefacts from even nonferromagnetic clips. Close control of blood pressure is essential in these patients.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0942-0940
    Keywords: Dura repair ; lyophilized dura mater ; heterologous lyophilized pericardium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a prospective, controlled randomized study either lyophilized bovine pericardium or lyophilized human dura mater have been used as a patch for the closure of the dura in 102 patients. The aim of this investigation was to compare both materials in terms of immunogenic response of the patients. The rate of post-operative complications was comparably low in both groups (wound infection in 1/51 patients each). In regard of workability, thicknesss of the material and flexibility the pericardium patches were judged to be by far superior. Neither signs of a cellular nor of an intesified humoral response could be detected in patients who received the pericardium implants. Thus, lyophilized bovine pericardium seems to be a superior alternative for the surgical repair of dural defects.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 141 (1999), S. 295-305 
    ISSN: 0942-0940
    Keywords: Keywords: Adhesion; CD44; extracellular matrix; glioma; integrins; invasion; migration.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes:  The complex receptor-ECM interaction in glioma cell invasion is discussed focussing upon the role of integrin receptors and matrix-metalloproteinases. Influencing these molecules or their regulation may lead to novel therapeutic approaches in the treatment of malignant glioma.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1435-2451
    Keywords: Isolated liver perfusion ; Portocaval hemofiltration ; Portosystemic encephalopathy ; Ammonia ; Colorectal carcinoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Während der isolierten Leberperfusion zur Chemotherapie von Lebermetastasen wird ein temporärer portocavaler Shunt angelegt und durch die Zwischenschaltung eines Hämofilters eine Senkung toxischer Metaboliten aus dem Pfortaderblut erreicht. Messungen bei Tierexperimenten und zwei Leberperfusionen bei Patienten mit Lebermetastasen nach colorectalem Carcinom ergaben, daß die systemischen Ammoniakspiegel nicht in toxische Bereiche anstiegen.
    Notes: Summary A temporary porto-caval shunt is constructed during isolated liver perfusion for chemotherapy of metastatic cancer to the liver and a portocaval hemofiltration is performed for reduction of toxic metabolites produced in the gut. When systemic ammonia concentration was measured during experimental perfusions in dogs as well as during isolated perfusions in two patients with liver metastases from colorectal primary cancer, the concentration level did not rise to a toxic level.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-7373
    Keywords: Brain tumor ; nitrosoureas ; neurotoxicity ; chemotherapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-7373
    Keywords: MTT assay ; test variables ; brain tumors ; chemosensitivity test ; cell culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The aim of this study was to optimize the experimental conditions of the MTT assay for primary cultures of human brain tumors. This assay is based on the mitochondrial reduction of MTT-(3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) salt to formazan crystals by living cells. Formazan can be quantified spectrophotometrically. This assay measures the antimetabolic and, by using an adequate recovery period for the cells, also the antiproliferative effects of cytotoxic drugs. Our results suggest the following experimental design for its application as an chemosensitivity assay for human brain tumors: 1-h drug exposure followed by a seven days recovery period without drugs. Then tumor cells are incubated 4 hours with 1 mg MTT/ml and final absorbance readings are performed at 550 nm and 630 nm as test and reference wavelengths respectively. In this way, the assay seems to be a reliable and simple method for rapid chemosensitivity testing in human brain tumors.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-7373
    Keywords: brain tumor ; MTT assay ; CFA ; in vitro chemosensitivity ; cell culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In this study we assessed the influence of patient- and drug-specific parameters in the short-term MTT-chemosensitivity assay in 150 primary cell cultures derived from human brain tumors. In 45 patients the MTT assay was directly compared with the CFA (Colony Forming Assay). Resistance was 10–20% higher in the MTT assay than in the CFA, but there was a good agreement in both assays, that more malignant gliomas had a higher in vitro chemosensitivity against ACNU and BCNU. Overall the results demonstrate, that there is no uniform correlation between the in vitro chemosensitivity and the histopathological classification of the tumors, which corresponds well to the clinical situation. On the basis of this study we suggest prospective clinical trials with the MTT assay in human brain tumors. Parts of this paper have been presented at the 63th annual meeting of the ‘Deutsche Gesellschaft für Neurologie’, September 13–15, 1990, in Darmstadt, Germany
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neuro-oncology 16 (1993), S. 177-178 
    ISSN: 1573-7373
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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