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  • 1980-1984  (1)
  • 1975-1979  (1)
  • 23Na+,87Rb+, and14N NMR  (1)
  • Langzeitbehandlung  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 55 (1977), S. 351-353 
    ISSN: 1432-1440
    Keywords: Plasma renin activity ; Long-term treatment ; Propranolol ; Essential hypertension ; Propranolol ; Essentielle Hypertonie ; Plasmareninaktivität ; Langzeitbehandlung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 17 Patienten im Alter von 40±9 Jahren mit essentieller Hypertonie wurden mit Propranolol als Monotherapie oral in Dosen von 120, 160 oder 240 mg pro die behandelt. Nach 4wöchiger Behandlung konnten der Blutdruck und die Herzfrequenz statistisch signifikant gesenkt werden und blieben auch bei Fortsetzung der Therapie nach insgesamt 6 Monaten unverändert. Die Plasmareninaktivität betrug vor Behandlungsbeginn 5,7±6,3 ng/ml/h und sank nach 4wöchiger Behandlung auf 1,8±1,3 ng/ml/h ab. 5 Monate später stieg das Plasmarenin im Durchschnitt wieder auf 5,0±0,9 ng/ml/h an. Der erneute Anstieg war ebenfalls statistisch signifikant zu sichern. Von den 17 Patienten hatten nach 6 monatiger Therapie noch 7 (41%) eine niedrigere Plasmareninaktivität als vor Behandlungsbeginn. Davon lagen aber nur 3 (18%) unter dem Wert, der nach 4wöchiger Behandlungsdauer bestimmt wurde. Aus den genannten Befunden wird geschlossen, daß der Wiederanstieg der Plasmareninaktivität möglicherweise ein reaktiver Mechanismus auf die langzeitige Blutdrucksenkung ist. Die Erniedrigung der Plasmareninaktivität nach Kurzzeitbehandlung mit Propranolol kann nicht als ein Mechanismus für den antihypertensiven Effekt dieses Medikaments bei der Langzeitbehandlung angesehen werden.
    Notes: Summary 17 patients (40±9 years) with essential hypertension were included in the study. A monotherapy of 120, 160 or 240 mg propranolol per day was administered orally according to the antihypertensive effect. Four weeks after treatment, blood pressure and heart rate showed a statistically significant decrease and remained unchanged over a period of six months. Plasma renin activity decreased significantly from 5.7±6.3 ng/ml/h at the beginning of the study to 1.8±1.3 ng/ml/h after 4 weeks. 5 months later however plasma renin activity increased again to 5.0±0.9 ng/ml/h. The difference was statistically significant. From 17 patients 7 (41%) had lower levels of plasma renin activity after 6 months treatment when compared with pretreatment values. In only 3 patients (18%) was plasma renin activity lower after 6 months than after four weeks. We conclude that the increase in plasma renin activity is a reactive mechanism to the reduced blood pressure under long-term conditions. The decrease of plasma renin activity in short-term treatment of essential hypertension is not a mechanism responsible for the antihypertensive effect of propranolol during long-term treatment.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-8927
    Keywords: Quadrupole relaxation ; 23Na+,87Rb+, and14N NMR ; ion-solvent interaction ; asymmetry effects ; preferential solvation ; acetonitrile-water mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Nuclear magnetic relaxation rates of23Na+,87Rb+, and14N in acetonitrile-water mixtures have been measured over the complete mixture range. The interaction of the quadrupole moment of ionic nuclei with electric field gradients is an excellent short ranged probe for the direct neighborhood of ions in solution. Thus the23Na+ and87Rb+ relaxation contains information about dynamics composition and symmetry of the inner solvation sphere in the mixed solvent. It was found that the relaxation rate of both ionic nuclei has an unexpected marked maximum in the acetonitrile (AN) rich region. The14N and2H relaxation rates of the solvent molecules revealed that the maximum could not be explained by dynamic effects. Further experimental results showed that it is caused by local symmetry changes. By measuring 1/T1 of the cationic nuclei in AN-H2O and AN-D2O it was possible for the first time to separate quantitatively asymmetry effects from selective solvation effects. It turned out that both cations are strongly preferentially hydrated. Comparison of the results of two approaches for the evaluation of the D2O-H2O isotope effect led to interesting hints concerning the location of the electric point dipole in acetonitrile molecules having contact with cations.
    Type of Medium: Electronic Resource
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