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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 62 (1984), S. 885-886 
    ISSN: 1432-1440
    Keywords: Cephalosporins ; Vitamin K1-epoxide ; Coumarin-like action
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In three patients treated with cephalosporins (one patient with latamoxef, two patients with cefazedone) vitamin K1 was injected to investigate whether this was followed by an increase in vitamin K1 2,3-epoxide plasma concentrations as compared to controls. Such a rise in K1-epoxide concentrations in the plasma can be demonstrated following treatment with coumarins. This reflects an inhibition of the vitamin K1-epoxide reductase in the liver. Coumarins are thought to induce hypoprothrombinaemia by such a mechanism. In all three patients we found a considerable increase in the vitamin K1-epoxide plasma concentrations following injection of 10 mg vitamin K1, whereas in normal subjects only traces of K1-epoxide could be detected (〈0.030 µg/ml). The K1-epoxide concentrations found in our three patients treated with cephalosporins were 0.12, 0.16 and 0.19 µg/ml, respectively. This indicates that latamoxef or cefazedone might reduce clotting factor synthesis by a coumarin-like mechanism of action in these patients. Although the effect of cephalosporins in enhancing vitamin K1-epoxide plasma concentrations is less than that of coumarins, it might cause severe hypoprothrombinaemia in the presence of latent vitamin K deficiency.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1440
    Keywords: Acetylsalicylic acid ; platelets ; thrombosis ; Cimino fistula ; uremia ; Acetylsalicylsäure ; Thrombocyten ; Thrombose ; Cimino-Fistel ; Urämie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In einer prospektiven Doppelblindstudie wurde der Einfluß von Acetylsalicylsäure auf die Häufigkeit von Cimino-Fistelthrombosen in der ersten p.o. Phase untersucht. Durch prophylaktische Gabe von Acetylsalicylsäure ließ sich der thrombotische Fistelverschluß auf 4% senken (Placebogruppe: 23%). Ein erhöhtes Thromboserisiko bestand bei schlechtem arteriellen Blutfluß, weiblichem Geschlecht und vorausgegangenen erfolglosen Fisteloperationen. Die Nebenwirkungen von Acetylsalicylsäure waren vertretbar, sofern Aspirin in niedriger Dosierung und in Verbindung mit Antacida verabreicht wurde.
    Notes: Summary In a prospective double blind study prophylactic administration of Acetylsalicylic acid (ASA) in low doses decreased significantly the rate of fistula clotting in the immediately p.o. period in uremic patients. The risk of fistula clotting was related to poor arterial blood flow, female sex and number of unsuccessful previous fistula operations. The incidence of side effects (g.i. and non g.i. bleeding) was acceptable with low doses of ASA and prophylactic administration of antacids.
    Type of Medium: Electronic Resource
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