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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Gefässchirurgie 3 (1998), S. 11-13 
    ISSN: 1434-3932
    Keywords: Schlüsselwörter a.v.-Shunt ; Arterioarterielles Interponat ; Key words Arteriovenous shunt ; Arterio-arterial interposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract We report on two patients who received arterio-arterial PTFE grafts as vascular access for chronic hemodialysis. In both patients prior surgery for arteriovenous fistulas using either subcutaneous veins or arteriovenous, artificial PTFE grafts had failed due to recurrent thrombosis and septic complications. The arterio-arterial grafts were each positioned as a subcutaneous loop on the thigh and anastomosed with the common femoral artery and the superficial femoral artery or the profunda femoris, respectively. Postoperatively, both patients received coumadine for anticoagulation. Nine months after surgery no complications were observed in the former patient. The latter patient experienced recurrent thrombotic occlusion of the graft and a new graft was required which was anastomosed end-by-end onto the common femoral artery. As yet, 5 months after the second operation, no further complications have been reported. In conclusion, in patients lacking suitable veins for arterio-venous anastomoses, artificial arterio-arterial grafts may provide vascular access for chronic hemodialysis.
    Notes: Zusammenfassung Bei 2 Patienten bestand nach Ausnutzung der subcutanen Venen sowie verschiedener Möglichkeiten a.v.-Interponate erneut der Bedarf eines Dialysezugangs. Es erfolgte die Anlage eines arterioarteriellen Interponats (PTFE) als Schlinge am Oberschenkel zwischen der A. femoralis communis und der A. profunda femoris bzw. A. femoralis superficialis. Beide Patienten wurden postoperativ antikoaguliert. Das Interponat im Bereich der A. femoralis superficialis funktioniert neun Monate nach Anlage unproblematisch. Bei dem Interponat zur A. profunda femoris kam es wiederholt zum Verschluß, so daß nach 6 Monaten an der gleichen Extremität ein neues Interponat terminoterminal im Bereich der A. femoralis communis angelegt wurde. Diese neue Interponat wird fünf Monate nach Anlage problemlos für die Dialyse genutzt. Arterioarterielle Protheseninterpositionen als Dialysezugänge können somit bei nicht geeigneter venöser Abflußbahn für die chronische Dialyse genutzt werden.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1437-1596
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 22 (1933), S. 132-143 
    ISSN: 1437-1596
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 26 (1970), S. 637-638 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die Autoxydation von Adrenalin in Anwesenheit von Mn++ wurde quantitativ untersucht. Es ergab sich, dass die durch 0,1 mM Mn++ bewirkte vollständige Oxidation von Adrenalin durch 5 × 10−5 g/ml Ascorbinsäure verhindert werden konnte.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1440
    Keywords: PAA gel electrophoresis ; fibrinogen ; fibrinogen derivatives ; fetal distress ; PAA-Gel-Elektrophorese ; Fibrinogen ; Fibrinogenderivate ; fetale Asphyxie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Häufigkeit intravasculärer Mikrothromben bei perinatal verstorbenen Neugeborenen veranlaßte die folgende Untersuchung. In nativen Plasmaproben und nach Fällung des Plasmas mit 2,5 molarem β-Alanin wurden hochmolekulare Fibrinogenderivate durch PAA-Gel-Elektrophorese und Intra-Gel-Immunpräzipitation identifiziert. Zwei Komponenten, die langsamer als Fibrinogen wanderten, wurden beobachtet. Ihre relativen elektrophoretischen Beweglichkeiten betrugen 0,17 und 0,27 (Fibrinogen: 0,43)×10−5 cm2/V×sec. Aufgrund des Laufverhaltens in der zweidimensionalen Gel-Elektrophorese in Gelen verschiedener Porengröße kann für beide Komponenten ein höheres Molekulargewicht, als das des Fibrinogens angenommen werden. Die beschriebenen Derivate wurden im Nabelvenenblut asphyktischer Neugeborener beobachtet. Ihr Auftreten war mit einem positiven Äthanoltest, einem statistisch signifikanten Abfall der Thrombozyten und des Fibrinogens und mit Zeichen fetaler Asphyxie korreliert.
    Notes: Summary The high incidence of intravascular fibrin deposits in stillbirths and newborns dying in the perinatal period prompted us to undertake the following study. High molecular weight derivatives of fibrinogen were identified in native plasma and in plasma after 2.5 M β-alanine precipitation by PAA gel electrophoresis and intra-gel immunoprecipitation. Two components were observed which migrated more slowly than fibrinogen. Their relative electrophoretic mobilities were: 0.17 and 0.27 (fibrinogen: 0.43)×10−5 cm2/V×sec. Two-dimensional gel electrophoresis in gels of different pore size indicated a higher molecular weight than that of fibrinogen for both components. The derivatives described were found in cord vein plasma samples of asphyctic newborns. Their occurrence was accompanied by a positive ethanol test, by a statistically significant decline of platelets and fibrinogen and by signs of fetal distress.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 52 (1974), S. 701-703 
    ISSN: 1432-1440
    Keywords: Isolated human ventricular myocardium ; c-AMP ; DB-c-AMP ; Positive inotropic effect ; Isoliertes menschliches Ventrikelmyokard ; c-AMP ; DB-c-AMP ; Positiv inotroper Effekt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Am isolierten menschlichen Ventrikelmyokard hatte c-AMP (10−4–10−3 M) keinen Einfluß auf die Kontraktionskraft. Im Gegensatz dazu wirkte DB-c-AMP (10−4−5·10−3 M) konzentrationsabhängig und reversibel positiv inotrop. Dieser Effekt ging einher mit einer Verkürzung von Anstiegzeit und Erschlaffungszeit der Kontraktion und wurde durch Vorbehandlung mit Propranolol nicht beeinflußt.
    Notes: Summary The contractile responses to c-AMP and DB-c-AMP were studied in isolated electrically stimulated human papillary muscle strips. C-AMP (1×10−4 to 1×10−3 M) had no effect on contractile force in all of 6 human papillary muscle preparations studied. In contrast, DB-c-AMP (10−4 to 5×10−3 M) produced a concentration-dependent and reversible positive inotropic effect which was associated by a decrease in time to peak force and in relaxation time and which was not inhibited by 10−6 M propranolol. The possibility of a clinical applicability of DB-c-AMP is discussed.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1440
    Keywords: Fenoterol ; Salbutamol ; Positive inotropic effect ; Beta2-adrenoceptor ; Human heart
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of fenoterol and salbutamol on isometric force of contraction were studied in isolated, electrically driven human papillary muscle preparations. Fenoterol increased force of contraction at concentrations of 1 µmol l−1 and higher. The maximally effective concentration of fenoterol (100 µmol l−1) increased force of contraction by about 130%. The positive inotropic effect of fenoterol was not influenced by 0.1 µmol l−1 prazosin. The beta1-selective antagonist atenolol (2 µmol l−1) and the beta2-selective antagonist ICI 118551 (1 µmol l−1) shifted the concentration-response curve of fenoterol to the right, indicating that beta1- and beta2-adrenoceptors may contribute to the positive inotropic effect of fenoterol. In contrast to fenoterol, salbutamol increased force of contraction only by about 11% at 100 µmol l−1. The results indicate that: (1) fenoterol exerts a direct positive inotropic effect in the human heart which may support the beneficial effects of the reduction of systemic vascular resistance in patients with congestive heart failure; (2) this positive inotropic effect of fenoterol is mediated by beta1- and beta2-adrenoceptors; (3) the clinically observed improvement of cardiac performance in the case of salbutamol is presumably not due to any direct positive inotropic effect.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 62 (1984), S. 717-723 
    ISSN: 1432-1440
    Keywords: Aldosterone antagonists ; Canrenone ; K+-canrenoate ; Negative inotropic effect ; Human heart
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of K+-canrenoate (Aldactone® pro inj.) and its metabolite canrenone on isometric force of contraction were measured in isolated guinea-pig and human papillary muscle preparations driven electrically at a frequency of 1 Hz. In guinea-pig hearts both substances exerted a concentration-dependent negative inotropic effect; the IC50 of K+-canrenoate and canrenone were 129±22 µmol l−1 (n=5) and 85±11 µmol l−1 (n=12), respectively. At the maximally tested concentration canrenone (250 µmol l−1) and K+-canrenoate (1,000 µmol l−1) reduced force of contraction by 68±4% (n=12) and 83±3% (n=5), respectively. The negative inotropic effects of canrenone and K+-canrenoate were not affected by 10 µmol l−1 atropine. The negative inotropic effect of canrenone was also not affected by 14 µmol l−1 aldosterone, but canrenone (10 µmol l−1) diminished the maximal positive inotropic effect of dihydro-ouabain from 554±75% (n=4) to 269±39% (n=4) of the predrug value. In human heart muscles K+-canrenoate and canrenone also exerted a concentration-dependent negative inotropic effect. K+-canrenoate (1,000 µmol l−1) and canrenone (250 µmol l−1) reduced force of contraction by 57±7% (n=8) and 67±2% (n=6), respectively. A positive inotropic effect of both substances was never observed. It is concluded that the improvement of cardiac performance after application of aldosterone antagonists observed in patients cannot be explained by a direct effect on the heart. K+-canrenoate and canrenone are devoid of any direct cardiotonic action. Instead, K+-canrenoate and canrenone have direct negative inotropic effects at high concentrations.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 58 (1980), S. 53-54 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 14 (1935), S. 388-389 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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