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  • 1
    Electronic Resource
    Electronic Resource
    Plasma dopamine-β-hydroxylase activity and the pressor effect of dopamine infusion in man (1976)
    Springer
    European journal of clinical pharmacology 10 (1976), S. 197-200 
    Details
    ISSN: 1432-1041
    Keywords: Dopamine-β-hydroxylase ; dopamine infusion ; blood pressure ; plasma ; man ; inter-individual variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In order to study the function of dopamine-β-hydroxylase (DBH) in human plasma, dopamine, its natural substrate, was infused intravenously in 22 healthy volunteers. Their plasma DBH activities showed great interindividual variations (31–301 units/ml). The infusion rates of dopamine required to increase systolic blood pressure (BP) by 30 mm Hg differed considerably between the subjects, and ranged from 3,0 to 11,6 µg/kg/min. No correlation could be shown between the various dopamine doses and individual plasma levels of DBH. It was concluded, therefore, that plasma DBH in the blood stream was enzymatically inactive. Experiments with human plasma DBH in vitro also support this interpretation. Consequently, interindividual differences in the effects on BP during dopamine infusion cannot be due to pressor effects of noradrenaline synthesized by plasma DBH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00558329
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of antituberculosis drugs on the plasma level of verapamil (1987)
    Springer
    European journal of clinical pharmacology 32 (1987), S. 107-109 
    Details
    ISSN: 1432-1041
    Keywords: verapamil ; rifampicin ; calcium antagonist ; drug interactions ; ethambutol ; isoniazid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The influence of antituberculosis drugs on the plasma level of verapamil was studied after its oral and intravenous administration. Six patients who had been treated for at least 6 months with a combination of rifampicin, ethambutol and isoniazid received a single oral dose of 40 mg verapamil. As compared to untreated subjects, the antituberculosis drugs greatly reduced the bioavailability of the calcium antagonist. Studies in patients in whom treatment with ethambutol and isoniazid had been discontinued revealed that the effect was due to rifampicin. The drugs for tuberculosis had no influence on the plasma level of verapamil when it was given intravenously. The findings can be explained by the induction of verapamil metabolizing liver enzymes in patients treated with rifampicin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00609969
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of verapamil in patients with renal failure (1985)
    Springer
    European journal of clinical pharmacology 28 (1985), S. 405-410 
    Details
    ISSN: 1432-1041
    Keywords: verapamil ; renal failure ; norverapamil ; pharmacokinetics ; haemodialysis ; ECG ; blood pressure ; heart rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of verapamil was studied in patients with end-stage chronic renal failure and in normal subjects after i.v. injection of 3 mg and a single oral dose of 80 mg. Plasma levels of verapamil and its active metabolite norverapamil were measured by HPLC. After i.v. injection, the terminal phase half-life and total plasma clearance of verapamil in both groups were similar. Haemodialysis did not change the time course of plasma verapamil levels after i.v. administration. After a single oral dose, the plasma levels of verapamil and norverapamil in both groups of subjects were similar. Subsequently, normal volunteers and patients with renal failure were treated for 5 days with oral verapamil 80 mg t.d.s. There was no difference between the 2 groups of subjects in the trough and peak levels of verapamil or of norverapamil. Intravenous and oral administration of the calcium channel blocking agent had similar effects on blood pressure, heart rate and the PR-interval in the electrocardiogram in both groups. The study demonstrated that the disposition of verapamil was similar in normal subjects and in patients with renal failure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544358
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  • 4
    Electronic Resource
    Electronic Resource
    The influence of chronic treatment with verapamil on plasma atrial natriuretic peptide levels in young and elderly hypertensive patients (1990)
    Springer
    European journal of clinical pharmacology 39 (1990), S. S39 
    Details
    ISSN: 1432-1041
    Keywords: ANP ; verapamil ; hypertension ; age
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In a double-blind, placebo-controlled crossover study, the plasma atrial natriuretic peptide (ANP) levels of nine young and ten elderly hypertensive patients were compared after placebo and after treatment with 120 mg verapamil given three times daily over 4 weeks. During placebo, plasma ANP levels proved to be higher in elderly patients than in young subjects. Chronic treatment with verapamil induced a rise in ANP levels in both young and elderly patients with hypertension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01409206
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  • 5
    Electronic Resource
    Electronic Resource
    A comparison of catecholamine concentrations and dopamine-β-hydroxylase activities in plasma from normotensive subjects and from patients with essential hypertension at rest and during exercise (1976)
    Springer
    Journal of molecular medicine 54 (1976), S. 561-565 
    Details
    ISSN: 1432-1440
    Keywords: Plasmakatecholamine ; Dopamin-β-Hydroxylase ; Essentielle Hypertonie ; Körperliche Belastung ; Plasma catecholamines ; Dopamine-β-hydroxylase ; Essential hypertension ; Physical exercise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In 8 normotensive subjects and in 8 patients with essential hypertension total catecholamine content and dopamine-β-hydroxylase (DBH) activity in plasma were measured at rest and during physical exercise. Catecholamine levels at rest were significantly higher in the hypertensive than in the normotensive persons whereas the 2 groups of subjects did not differ in DBH activity at rest. At a work load of 150 watts there was a more pronounced increase of the catecholamine concentrations and of the DBH activity in the hypertensive patients than in the normotensives. One may conclude from the data that there is an increased sympathetic nerve activity in patients with essential hypertension.
    Notes: Zusammenfassung Bei 8 Normotonikern sowie bei 8 Patienten mit essentieller Hypertonie wurden die Konzentrationen der Gesamtkatecholamine und die Aktivität der Dopamin-β-Hydroxylase (DBH) im Plasma unter Ruhebedingungen und während körperlicher Belastung gemessen. Bei den Hypertonikern waren die Ruhewerte der Katecholamine signifikant höher als bei den Normotonikern, während die DBH-Aktivität unter diesen Bedingungen bei beiden Gruppen gleich war. Bei einer Ergometerbelastung von 150 Watt stiegen die Katecholaminspiegel und die DHB-Aktivität bei den Hochdruckkranken stärker an als bei den Probanden mit normalem Blutdruck. Aus den Untersuchungsergebnissen kann man schließen, daß bei Patienten mit essentieller Hypertonie eine erhöhte Aktivität sympathischer Nerven besteht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01619571
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    Paper (German National Licenses)
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