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  • Chemistry  (3)
  • Hämodynamik  (2)
  • Acute cardiac toxicity  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 106 (1983), S. 143-147 
    ISSN: 1432-1335
    Keywords: Doxorubicin ; Acute cardiac toxicity ; Prevention
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In two groups of female patients with metastatic breast cancer who had all been pretreated with doxorubicin (350 mg/m2), acute cardiac effects following i.v. doxorubicin bolus injection (60 mg/m2) were recorded on the basis of systolic time intervals (STI). In six patients who received doxorubicin only the ratio between the heart-beat-corrected preejection period and left ventricular ejection time (PEPI:LVETI) as well as the PEP index were found to be significantly increased with a peak at 6 h following drug infusion (P〈0.001). Another six patients received an identical chemotherapeutic regimen and, in addition, a combination of tocopherol (200 mg i.m. 6 h before treatment) and nifedipine (60 mg p.o. daily from 2 days before doxorubicin infusion). In the pretreatment group, the PEPI: LVETI ration and PEP index remained unchanged during the posttreatment period. Pharmacokinetic analysis of drug concentrations in the plasma revealed a significantly accelerated distribution and elimination of doxorubicin after combined tocopherol and nifedipine pretreatment, although no statistically significant differences could be found in calculated drug levels in the peripheral compartment between both treatment groups. Our results indicate that acute cardiac reactions reflected by changes in STI values can be prevented by combined tocopherol and nifedipine pretreatment.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 158 (1972), S. 288-297 
    ISSN: 1433-8580
    Keywords: Oxyfedrin ; Propranolol ; Hemodynamics ; Myocardial metabolism ; Hepatic metabolism ; Oxyfedrin ; Propranolol ; Hämodynamik ; Herzstoffwechsel ; Leberstoffwechsel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Trotz vorheriger Gabe von Propranolol bewirkt Oxyfedrin beim Hund einen signifikanten Anstieg der Frequenz, des arteriellen Spiegels der freien Fettsäuren, der arteriellen 3-Hydroxybutyrat-Konzentration und der Aufnahme von freien Fettsäuren in die Leber sowie eine ebenfalls statistisch gesicherte Verminderung des coronaren Widerstandes. Ein Vergleich der gefundenen Wirkungen mit bereits publizierten Ergebnissen zeigt dennoch eine, wenn auch nur partielle Blockierbarkeit der Oxyfedrineffekte durch Propranolol. Die anderen, z. T. gegenüber der alleinigen Gabe von Oxyfedrin sogar verstärkten Wirkungen wie die signifikante Abnahme des arteriellen Spiegels und der myokardialen Bilanz von Pyruvat werden durch gleichsinnige, additive Wirkungen von Propranolol und Oxyfedrin erklärt.
    Notes: Summary Following beta-adrenergic blockade with propranolol, infusions with oxyfedrin caused significant increases in heart rate, arterial free fatty acids and 3-hydroxy-butyrate levels, uptake of free fatty acids into the heart and liver, and a significant decrease in coronary vascular resistance. A comparison with data from previous experiments without beta-adrenergic blockade shows at least a partial blockade of the hemodynamic and metabolic effects caused by oxyfedrin. The other metabolic parameters, showing identical changes with oxyfedrin and propranolol, could not be taken for a comparison of the action of oxyfedrin before and after betaadrenergic blockade.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Clinical and experimental medicine 155 (1971), S. 304-314 
    ISSN: 1591-9528
    Keywords: Oxyfedrin ; Hemodynamics ; Myocardial metabolism ; Hepatic metabolism ; Oxyfedrin ; Hämodynamik ; Myokardstoffwechsel ; Leberstoffwechsel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Oxyfedrininfusionen an Hunden bewirken einen lang anhaltenden signifikanten Anstieg von Frequenz, Coronarflu\, dp/dt und myokardialem Sauerstoffverbrauch. Während der arterielle Mitteldruck nur gering sinkt, ist die Abnahme des coronaren Widerstandes ebenfalls statistisch gesichert. Die arteriellen Spiegel der Freien Fettsäuren sowie von Acetacetat und 3-Hydroxybutyrat zeigen ebenso wie die Aufnahme dieser Substrate in das Myokard eine Zunahme, die jedoch nur bei den Freien Fettsäuren signifikant ist. Auch die hepatale Aufnahme der Freien Fettsäuren nimmt unter Oxyfedrin zu, während die Ketonkörper vermehrt aus der Leber abgegeben werden. Umgekehrt ist die Wirkung der Substanz auf die Metaboliten des Kohlenhydratstoffwechsels. Während die arteriellen Spiegel sowie die myokardialen Bilanzen von Pyruvat und Lactat statistisch gesichert abnehmen, werden diese Substrate — gegenüber einer hepatalen Aufnahme in der Vorperiode — unter Oxyfedrin aus der Leber abgegeben. Die Glucose wird, mit Ausnahme einer signifikanten Abnahme der myokardialen Aufnahme, nur gering beeinflu\t. Auf Grund der erhobenen Befunde wird eine betamimetische Wirkung der Substanz angenommen.
    Notes: Summary Intravenous infusions of 10 ug/kg/min oxyfedrin exhibit significant increases in heart rate, coronary blood flow, dp/dt and myocardial oxygen consumption together with decreases in mean arterial blood pressure and coronary vascular resistance. Arterial level as well as the myocardial uptake of free fatty acids, acetoacetate and 3-hydroxy-butyrate rise distinctly, accompanied by an increasing hepatic extraction of free fatty acids and higher release of ketone-bodies by the liver. Glucose levels are only slightly effected by oxyfedrin infusions, but arterial levels, myocardial uptakes and hepatic extraction of pyruvate and lactate decline continuously, leading even to release of the two substrates from the liver. Based on these results oxyfedrin is discussed as aΒ-adrenergic sympatomimetic agent.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 313 (1971), S. 882-888 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sowohl durch Umsetzung von α-Brommethyl- als auch von α,α-Dibrommethyl-aryl-ketonen mit Hydrazin lassen sich 1-Amino-4-aryl-1,2,3-triazole darstellen, deren reduktive Desaminierung 1-H-4-Aryl-1,2,3-triazole liefert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 304 (1960), S. 181-184 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: All modifications of iron(III) hydroxide are transformed into silver-iron(III) oxide, AgFeO2, by reaction with freshly precipitated silver oxide in hot sodium hydroxide solutions. The transformations having different velocities for the indicidual iron(III) hydroxide species occur in the liquid phase.The Structure of AgFeO2 is similar to that of α-NaFeO2.
    Notes: Alle Modifikationen von Eisen(III)-hydroxid werden nach der Vorschrift von Krause, d. h. durch Erwärmen mit gefälltem Silberoxid in Natronlauge, in Silbereisenoxid AgFeO2 umgewandelt, wenn auch sehr verschieden rasch. Die Umsetzung erfolgt über die Lösung. AgFeO2 besitzt eine ähnliche Struktur wie α-NaFeO2.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 1025-1039 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Graft copolymers were prepared by the radical-initiated polymerization of methyl methacrylate in aqueous slurries of granular corn starch. High conversions of monomer were realized, giving products which were readily recovered by filtration. The products were free-flowing, white powders, which by microscopic examination looked much like granular starch. Grafting was demonstrated by extracting the granular products with ethylene dichloride, which in most instances removed only a minor part of the poly(methyl methacrylate). When azoisobutyronitrile was used for initiation, a high conversion of monomer resulted, but about 90% of the polymer was extractable with ethylene dichloride. Further evidence for grafting was obtained by extraction of predissolved product, prepared by dissolving the granular product in dimethyl sulfoxide, to destroy the structure of the starch granules, and precipitating with alcohol. The fractions soluble in ethylene dichloride contained significant amounts of carbohydrate. Similar treatment of product prepared with azoisobutyronitrile initiation or of physical blends of starch and poly(methyl methacrylate) gave much more efficient separation of starch from PMMA. Failure to obtain grafting with AIBN initiation suggests that grafting occurs mainly as a result of attack on starch by radicals generated by the reaction of hydrogen peroxide or organic hydroperoxide with ferrous iron. Acid hydrolysis of the products removed the starch. The PMMA so recovered typically had viscosity-average molecular weights of the order of 106, which suggests the grafts contained very long branch chains of PMMA attached at very infrequent intervals.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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