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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 27 (1971), S. 810-811 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung β-Rezeptorenblocker hemmen den aktiven Kalziumtransport an isolierten Herzmitochondrien und den phospholipidvermittelten Kalziumtransport in Ausschüttelungsversuchen. Die Hemmung des mitochondrialen Kalziumtransportes lässt sich durch Phosphatidylserin und weniger stark durch Lecithin (≧10−4 g/ml) aufheben, während andere Phospholipide und deren Bausteine wirkungslos sind.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 159 (1972), S. 65-74 
    ISSN: 1433-8580
    Keywords: Cardioactive glycosides ; Respiratory acidosis ; Alcalosis ; β-sympatholytic drugs ; Herzwirksame Glykoside ; Respiratorische Acidose ; Alkalose ; β-Sympathicolytica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An narkotisierten Katzen wurde der Einfluß des Blut-pH auf die Toxicität herzwirksamer Glykoside untersucht. An isolierten Vorhofpräparaten wurden in Ergänzung hierzu Versuche mit Änderung des pH der Tyrodelösung durchgeführt. 1. An Katzen wird durch eine respiratorische Acidose (pH 7,0) die Toxicität des Digitoxins, Digoxins und k-Strophanthins signifikant erhöht; dabei ist die Toxicität des Digitoxins stärker erhöht als die des Digoxins und k-Strophanthins. 2. Vorbehandlung mit Reserpin oder Practolol vermindert die Toxicität des Digitoxins in Acidose wesentlich stärker als bei normalem pH. 3. Eine durch Tris-Infusion erzeugte Alkalose von pH 7,6 bewirkt keine Änderung, eine durch Infusion von NaHCO3 erzeugte Alkalose von pH 7,6 verursacht eine geringfügige Steigerung der Digitoxintoxicität. 4. Am isolierten Vorhofpräparat des Meerschweinchens ist die Toxicität des Digitoxins, Digoxins und k-Strophanthins bei pH-Werten der Tyrodelösung von 7,0 und 7,8 nicht signifikant verschieden.
    Notes: Summary In anaesthetized cats the influence of blood-pH on the toxicity of cardiac glycosides was studied. In isolated guinea pigs atrias further experiments were performed by changing the pH of the tyrode solution. 1. In cats with respiratory acidosis (pH 7.0) the toxicity of digitoxin, digoxin and k-strophanthin is enhanced — thereby the toxicity of digitoxin is more enhanced than that of digoxin and k-strophanthin. 2. Pretreatment with reserpine or practolol diminishes the toxicity of digitoxin in acidosis more than at normal blood-pH. 3. An alcalosis of pH 7.6, produced by the infusion of tris causes no change, an alcalosis of pH 7.6 produced by the infusion of NaHCO3 causes a small increase of the toxicity of digitoxin. 4. In the isolated guinea pigs atria the toxicity of digitoxin, digoxin and kstrophanthin is not different at pH 7.0 and 7.8 of the tyrode solution.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 270 (1971), S. 79-86 
    ISSN: 1432-1912
    Keywords: Circulation ; dp/dt max ; Cats ; β-Adrenergic Blocking Drugs ; Isoproterenol Antagonism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In closed-chest cats, anaesthetized with pentobarbital, a comparative study was carried out of the cardiovascular actions of fourβ-receptor blocking agents [propanolol, practolol,d(-) INPEA and LB 46] as well as of their antagonism to the effects of isoproterenol. Theβ-receptor blocking agents were injected intravenously in increasing doses until the positive inotropic action of isoproterenol was abolished. Changes in maximum rate of rise of ventricular pressure (dp/dt max) were taken as a measure of the inotropic action. Heart rate, enddiastolic ventricular pressure, ventricular pressure, arterial pressure and ECG were recorded. The following results were obtained: 1. Propranolol and practolol decreaseddp/dt max to a greater extent than did INPEA, whereas LB 46 in small doses was without effect and at larger doses caused an increase indp/dt max. 2. Propranolol caused a more pronounced decrease in heart rate than did practol or INPEA. Small doses of LB 46 decreased the heart rate, but this decrease was not further enhanced by increasing the dose. 3. Propranolol, practolol and INPEA decreased systolic and diastolic pressure more markedly than did LB 46. 4. The hypotensive action of isoproterenol was antagonized by propranolol, LB 46 or INPEA to a greater extent than its inotropic action; practolol however, had no influence upon the hypotensive action of isoproterenol. 5. The enddiastolic ventricular pressure was not affected by theβ-adrenergic blocking agents, but was significantly enhanced by a subsequent injection of noradrenaline.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 274 (1972), S. 74-80 
    ISSN: 1432-1912
    Keywords: Hypoadrenalism in Rats and Guinea Pigs ; Na+ + K+-ATPase ; Sensitivity to Strophanthin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In adrenalectomised rats and in guinea-pigs pretreated with metyrapone the specific activity of the Na+ + K+-stimulated ATPase of heart and kidney is significantly diminished, whereas the activity of the Mg++-ATPase remains unchanged. The specific activity of the Na+ + K+-stimulated ATPase from brain tissue is not influenced by either adrenalectomy or by treatment with metyrapone. The sensitivity of the Na+ + K+-stimulated ATPase of heart, brain and kidney to k-strophanthin remains unchanged by adrenalectomy or by treatment with metyrapone.
    Type of Medium: Electronic Resource
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